@Coogan: I know that, and the program has been installed there, but it doesn't help me.
Think I cannot answer all your questions. My technician left no information. Just a pc with W10 and some main progs, including MB.
== I did ask him before I left to give me ALL admin permissions, which he promised.
== I did not use the Windows Store version. In case HE did, I uninstalled MB and used the most recent https://www.dropbox.com/s/3gdlq4ohu8f2tz1/MusicBee_Setup_3_3_7077.zip?dl=1
== I just unzipped and installed that. But then the message said that it could not be written on C
== I don't know anymore if I have the 'installer version' previously. Which one you mean? And how previously? In my previous W10 version?
== Don't remember how I saved all the user files, but have several backups of previous installations. But how do distinct the correct files from the incorrect/outdated ones.
== The same technician (who is travelling now) installed MB easily a few months ago, directly from the W7 OS to the first W10 OS on the same pc. Easy to copy/migrate settings, looks, layout, theme. But that first W10 had a myriade of errors, so he offered a fresh W10 installation while I was travelling and he had enough time. The current config has only one OS, so no option to copy settings from OS-old to OS-new
Sorry if I misunderstand or do things wrong. Am just a user. No pc or windows expert...
Hope I clarified my problem more...