MuseScore 3.3 can't be opened in macOS 10.15 Catalina

I've got same issue here.

Software needs to be updated.

See this FAQ section, to work around this issue you need to right-click MuseScore application and select "Open" in the pop-up menu. This happens due to the new security policies in MacOS Catalina, and many applications have not adapted to it yet.

And I believe this is not restricted to MuseScore 3.3, or is it?

What are the risks and issues about "malicious software" infesting my iOS. I'd rather not risk the integrity of my iMac. I'm sure other users know far more about software risks and issues than I, so please offer honestly helpful suggestions as to why MuseScore hasn't worked out the problem.

Is MuseScore working to rectify the incompatibility issue and remove the risk of male-ware infestation on iMac's? Not too conformable with "work-arounds" that essentially "by-pass" security feature designed to protect my iMac integrity.

Thank you dmitrio95, it opened... But the program is closing in 2-3 seconds :s

what is "you need to right-click" with a computer one mouse?

with one mouse button I guess. It is the 'secondary click', however that is set up for your Mac, 2 finger swipe, Ctrl+cloc, os something like that

thank you, but with my computer I cannot be able to open it, also using "open" in the panel

This did not help me. I still get the malware response

Does musescore have a help line? I have all my music score on this system and it's Christmas - Arrgh!

Can I revert to Musescore 2? I need my scores!

Does musescore have a help line? No, support is donw via the forum and the issue tracker only.
it's Christmas not quite yet...
Can I revert to Musescore 2? Yes, sure, available from the download page, further down, https://musescore.org/en/download#Older-and-unsupported-versions

You tried the procedure in https://musescore.org/en/faq#faq-296716? What were the results at each step of the process?

> This did not help me. I still get the malware response

Right-click + Open should indeed open the same warning dialog but this time it should have an "Open" button which would allow to run the application.

Now my catalina 10.15.1.runs with MuseScore 3.3.3.24345, I don’t know what happened, but it runs; the problem is that MuseScore 3 read MuseScore 2, but 2 cannot read 3

That is true and a well known fact, and the reason for the major version number change.
Export as MusicXml in MuseScore 3, import that in MuseScore 2

I've had to go back to MuseScore 2. Can't make any headway with 3 and catalina. I wish MuseScore could give us some help!

Did you try the workaround mentioned here?

yes, I did. I'm going to trash 3.3 and go back to 2. I have a lot of work to do.

What specifically went wrong when you tried those steps? We are trying to help, and those steps seem to have worked for others. If there is something unique about your system causing it not to work for you, we need you assistance in helping us figure that out. So could you please tell us what specifically went wrong when you followed those steps?

following the thread you suggested, I was able to open MuseScore 3 but could not open past files. I got a red stop sign with an exclamation mark and the message: Cannot read file/Users/rozgnatt/Desktop/A Service of Lessons and Carols/My soul gives glory to the Lord.mscz: Operation not permitted
Can I remove MS3 without further injuring my many score files?

You need to give MuseScore an access to your disk or at least to folders which contain the necessary files. This is due to the new security policies enforced by Apple in the new Catalina system and does not depend on MuseScore 3 at all. The only thing MuseScore can do is to embrace a procedure of notarizing applications by Apple so no "malicious software" warning pops up, but this will not remove the requirement to give an access to folders which you need MuseScore to be able to operate on.

Thanks for the info but i have no idea what you're talking about - at least in terms of how I allow MuseScore access to my files. Over 20 years ago I went to Mac so I could concentrate on things other that computer programming stuff. If you could tell me how I go about giving MuseScore access to my disc or folders, that would be great - I think...

See https://musescore.org/en/faq#faq-296716

Catalina is very different in this way. It is not a MuseScore problem. You must go to (Apple) > System Preferences > Security and Privacy > Privacy, with Admin access, and add MuseScore to "full disk access" or specific folders as you want. Catalina demands your assent to mediate an application's desire to access your folders.

Thank you, BSG! Your instructions were clear and understandable to me - a non-computer-savy person.
MS 3 opened without a problem as soon as I added it and clicked the lock closed.

Hi guys. To install MuseScore in MacBook Pro Catalina you have to go to System Preferences > General > then click on the lock that is down on the left. After that you can click on > App Store and identified developers. Once you do that you should be able to see a chart that will say “Open Anyway.” So click on that on, and you must be able to use MuseScore.

Good luck!!

By (Apple) Design : new security feature that MuseScore developers (or any other application developers) cannot program around.

Users just have to educate themselves with the workaround, withttps://musescore.org/en/faq#faq-296716

I thought that if the work were signed with the appropriate Apple-reegistered signature, it would not issue this warning; it is complaining of the lack of it.

See also https://apple.stackexchange.com/questions/366542/install-spotify-cant-b…

Catalina requires all apps that are signed with developer IDs to be 'notarized' by Apple
...

1. Right-click and select "Open". This may bring up the same dialog, but with an option to Open the file anyway.
2. You can get round this by removing the quarantine Extended Attribute on the file:
   xattr -d com.apple.quarantine /path/to/file

And https://developer.apple.com/developer-id/

The latter indicates actions is needed from the MuseScore developers.
The former gives a 2nd workaround (that command line)

How???? What do I do????

Can you make a video? I can't quite understand.... :(

How what? (and no, I won't make a video, and I can't, not owning a Mac myself)

Thank you, that did it.

Thank you so much, I was able to open it following your instructions!

@dmitrio95 Will this issue be addressed for 3.4? Will notarisation be added?

We have just completed notarization of 3.3.4 and 3.4-Beta versions of MuseScore. As MacOS Gatekeeper searches for notarization information online this issue should be already fixed for these versions. New versions will likely include notarization information bundled with .dmg image so MacOS could verify notarization even in the absence of Internet connection.

Therefore this issue can probably be considered fixed. Please report if you still have any issues with the recently released versions of MuseScore.

Sounds good! Thanks, Dimitri.

Automatically closed -- issue fixed for 2 weeks with no activity.

I also have the same problem. AND I NEED IT FOR SCHOOL!!! GOD!

i had the same problem but if you press the question mark in the bottom left of them pop-up it will take you to apples support page where it shows how to overide the prompt.
it under security ands privacy, general

See also https://musescore.org/en/faq#faq-302904

I did something similar to this! I went into finder>applications and clicked on musescore, and then I clicked on the settings icon on top and selected "Open". It popped up with the same warning message, except it still let me open musescore anyway.

I can open Musescore on MacBook, Catalina version 10.15.3.

Not sure if this forum is closed or not, but this problem is very easy to take care of:
-Go to System Preferences
-Go to Security & Privacy
There should be a section towards the bottom labeled "Allow apps downloaded from:". If you have already tried opening up Musescore 3, it should be listed beneath the first two check boxes as an app Apple cannot open because it can't check for malicious content. There should be a button there allowing you to open it anyway, and it'll tell you again that it "isn't safe" because Musescore isn't made by one of its trusted developers. Go ahead and click open and you should be good to go.
Hope this helps somebody!

still not working...I don't see "allow apps downloaded from" and Musescore 3 not listed, even though I downloaded it...quite frustrating...grrrrr....

See https://musescore.org/en/faq#faq-302904

thank you this works

I want to use MuseScore for my school work on my Mac but, it doesn't want work. What should I do?

See https://musescore.org/en/faq#faq-302904