Mpluginmanager auto-update fails – MeldaProduction Forum

Interesting, this issue seems to be related to OneDrive sync or folder permissions, especially since the folder is redirected to OneDrive. Please check that the Downloads folder on OneDrive is available locally. Right-click on the Downloads folder, and choose “Always keep on this device” from the OneDrive menu. This ensures that the files are stored locally and not just in the cloud. This can fix your issue. MPluginManager downloads self update setups to current’s users Donwloads folder and it cannot be changed by user in current version.

Anyway, I understand this can’t be solution for all cases so I will make a simple fix for this, if there is trouble downloading it to Downloads folder, I will execute the setup from current users temp folder, which is not redirected and there should be no issue there.