If anyone has the same problem, try the following.
Install the plugin on your local server on your own PC, not on your hosting. If the problem persists, create a new Support Request.
If the problem disappears, then the problem is on the side of your hosting, which does not allow you to programmatically edit the plugin. In this case, either contact your hosting support or configure your plugin on your local server, then restart Hud. After that, transfer Hud.cs and Hud.json from your local server to your main hosted server, done!