Unnecessary Download Time Cap
There's a bug where if you're downloading a soundfont within the musescore program (MDL sounds or better sounds in general) and the download takes longer than 20 seconds, the download aborts. This makes it impossible to have any MDL (drumline) sounds, unless you have really good internet. Please fix this.
Comments
See #315198: Downloading MDL extension fails, #312737: Update at help menu, #314950: Downloading MuseScore_General_HQ extension fails, it is fixed, but that fix is not yet realeased and prabably won't before MuseScore 4, but see the workarounds mentionedt there