Cannot install extensions (e. g. Drumline) on my MacBook Pro

• Nov 9, 2019 - 10:44

Cannot install extensions (e. g. Drumline) on my MacBook Pro
When trying to install the extension "MuseScore Drumline" (or "MuseScore General HQ") on my MacBook Pro it fails saying "Can't import extension in read-only-memory: MacBookPro"

Mac OS Catalina
10.15.1
solid state disk 500 gb, 282 gb free disk space, 16 GB RAM

Thank you for any help

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