Fixing WordPress SSL CA Cert Error on AMH Panel
After forcing HTTPS on the blog backend, I encountered a "Download failed. Problem with the SSL CA cert (path? access rights?)" error when upgrading WordPress plugins. It was later discovered that the issue stemmed from the web server itself.

The VPS is running the AMH 4.2 virtual host panel. According to online resources, enabling SSL in WordPress can trigger this issue. The solution involves installing the AMChroot module, setting the corresponding website to compatibility mode, and then upgrading the plugins or themes.

The problem was ultimately resolved. For security reasons, after successfully upgrading WordPress plugins or themes in compatibility mode, the setting should be switched back to secure mode to prevent cross-site attacks.