In Kodi 21.1 I’m trying to update the Youtube add-on. The latest version shown in the Add-on manager is 7.0.6.3 (installed version is 7.0.5) but the update fails. Removing the old version and installing the new one from scratch also fails. The kodi.log shows why:
CCurlFile::Open - <https://mirrors.kodi.tv/addons/omega/plugin.video.youtube/plugin.video.youtube-7.0.6.3.zip> Failed with code 404:Pointing a web browser at https://mirrors.kodi.tv/addons/omega/plu….0.6.3.zip confirms the 404 HTTP response. Looking at https://mirrors.kodi.tv/addons/omega/plu…o.youtube/ reveals that the only versions of the add-on there are 7.0.9, 7.0.9.1 and 7.0.9.2. Kodi has apparently failed to notice this for some reason. But only for this add-on, because other add-ons are being updated and installed just fine.
My questions: how is Kodi supposed to keep track of repo updates? What could cause it to fail in the case of this particular add-on? How do I force Kodi to re-sync with the repo? (Rebooting and leaving the system to do its thing overnight didn’t work.)
Update: now that I think of it, I seem to have had this problem before with the Youtube add-on. I remember having to install the first version from a ZIP that I downloaded manually from the repo. I could do that again, I suppose, but AFAIK that may break automatic updates of this add-on in the future. Although it’s somewhat broken right now, too, I suppose… 
So where to go from here? All suggestions welcome. Tnx!