I have purchased all the packages for Armor Inspector and Map Inspector. All items work fine on my iPad and Phone, however, none of the purchases work on my PC.
Could you try to log out and log in with your WG account in the apps? After you sign in with your account it will send the purchases to the server and assign them with your account. Then you could try to use your WG account on PC and it should work. Let me know if you have any questions.
I see purchases were properly assigned to your WG account, but i don't see the request from the web version to check the purchases. Could you check that you were logged in when accessing web version? Could you try to use different browser? Another suggestion is to try to clear browser cache or access web version in the incognito (private) mode to make sure it doesn't read anything from the cache. And if you could get logs from Web Console, it will also help me to understand the issue, maybe something is blocking the app to request the purchases information and there are errors in log. Web Console is part of developer tools installed in the browser, in Chrome they are accessed by F12.
I still can't figure out why web version doesn't send request to the server to check the purchases for your account (i don't see it in the log), but could I ask you to try this mod wgmods.net/2319/? Just download it to World_of_Tanks/mods/188.8.131.52 folder. It's the same Armor Inspector, it opens web browser but it uses data directly from the game and has a different logic to check the purchases. Please let me know whether it works or not. In case it doesn't work, could you send me python.log file from the game's folder?