SDLXLIFF Toolkit version (4.1.5.0 > 4.1.5.1)

I tried to update SDLXLIFF Toolkit from 4.1.5.0 to 4.1.5.1:

but the version shown in Plugin Manager still shows the old version 5.1.5.0:

So the notification pops up again to update the same plugin.

I tried uninstalling the plugin in Plugin Manager and downloading manually the plugin from the AppStore but to no avail.

Can anybody confirm this issue?