[chrissix666]

My problem is not the studio icons, but the media icons pack, see screenshot. Still having the same problem today.
When I go into movies, all my media icons disappeared.

The studio icon updates were still broken for me today, but I managed to fix it. The update from zip still produces a failed update error but you can manually copy and overwrite the resources folder from within the zip file above using file manager but wont take effect until kodi is shut down and restarted.

Install from repo or install from zip?
All Media/Studio Icons addons are simple resource addons, i'm currently also on developing some resource addons and some members have also sometimes problems on install.
Try install from zip instead of install from repo.
restart kodi and after the restart make a install try.

If still don't work, post the .xml code of the addon.xml here (file in the zip)
Maybe addon got an update and using extended addon xml tags, when i use these extended tags my addons also won't install, i had to get rid of them all and only use the basic addon xml tags.