iMovie cannot be updated because it was refunded or purchased with a different Apple ID
I'm new to Mac OS - and indeed Macs. This has happened a couple of times (e.g. with Pages, rebooted, it worked).
It seems like a typically obscure Apple message that tells me nothing. It's a new Mac - setup by me with my one and only Apple ID. I have not "refunded" this and it was "purchased" with said ID.
I'm a fan of iPhones and iPads - and there's loads to like about the Mac - but it's way more irritating than Windows when it comes to stuff like this.
Help...!