AGS cannot be updated ingame, you need to do this outside of the game. Addons or other files cannot be downloaded/uploaded from the ESO game.
The spinner at the guild store got nothing to do with downloads of addons. It's just a feature of AGS showing you the information about the current guild data fetched from the servers.
!!!Logout!!!
Or you might get in trouble with addon and/or library updates.
Then use Minion and delete AGS completely + SavedVariables or delete it manually.
Reinstall it then via Minion or manually.
Check here if you got the correct Addons folder so you do not update addons with Minion in the wrong folder and ingame nothing changes:
https://www.esoui.com/forums/faq.php..._howto_install
-> Best hint to find the AddOns directory: Search for the file "AddOnSettings.txt" on your harddrive. It should be in the folder where your AddOns folder is located too.
-> Be sure to check if OneDrive is enabled and if your documents folder is in there. If so remove the elder scrolls online folder from it again so it will be in the old documents folder again. ESO does not like the OneDrive folder.
Then login, enable AGS and the needed libraries. I reommand to use "Votans Addon List" as well as it will automatically enable the dependencies for you (like libraries) if you enable an addon.