Ah, I see.Hmm I'm not sure but if the plugin removed the last dot MediaPortal would display the icon correctly. But you're right, perhaps it should be fixed elsewhere instead.
[2018-09-28 01:09:34,411] [Log ] [LogoManager Grabber] [INFO ] - Generated logo for the TV channel "Nick Jr." (ID=13337) from remote file "Nick Jr.png": "C:\ProgramData\Team MediaPortal\MediaPortal\Thumbs\TV\Logos\Nick Jr..png".
Yes. You need to stop/deactivate the TvService service before installing MP2 .To switch back stop the MP2 Server Service and reactivate MP1's service.Can I have both MP1 and MP2 running side-by-side, just to test MP2 without removing/overwritting anything in MP1?
Nope, LogoManager will work fine on old MP as I'm on 1.3 myself. It's because noone is using installation from site nowadays snce we have Extensions Manager as app and Extensions plugin in MediaPortal itself. I didn't test the case with upgrading from MP site plugin installation but you've tried it seems and it's not working. Last thing you could check is your list of extensions is up-to-date by clicking Upgrade list in Extension Manager's dropdown menu. If you stil can't upgrade I suggest you to delete site's plugin and install LogoManager plugin from Extensions Manager. It should be here.Is it because I', not running the newest MP version?
Nope, not necessarily.Perhaps I should switch to MP2 and give it a try (again)