"FCP cannot be used because it's being upgraded"
FCP 10.4.6 on a Mac Mini 7,1 (OS 10.13.6).
When I try to open it, I get the alert "Can't Use FCP because it's being Upgraded". There is no upgrade available for this version, nor did I ask for one. This just happened a few days ago, after 7 years of great performance.
How do I break this hold.
TIA,
Earlier Mac models