@starman71,

In case you have some addons or the Go2wpForo plugin installed, the auto-update to wpForo 2.0 will cause errors, and you may not even login to your website. Please note that the old verion of addons are not compatible with wpForo 2.0. You should only use addons with 3.0.x version.

Solution (You do not have access to WordPress Dashboard):

1. In this case, you should use an FTP client or the File manager of your Hosting cPanel and delete addon folders from /wp-content/plugins/ directory. Also, please delete /go2wpforo/ folder if you have installed it, this plugin is only used to migrate from other forum softwares, it's not necessary anymore.
2. Then download new version of addons (3.0.verions) from your account page: https://gvectors.com/my-account/
3. Install addons in Dashboard > Plugins > Add New (use the select file form and upload the installation zip file)
4. And activate all addons with 3.0.x versions
5. Make sure wpForo version is 2.0.x and it's active