UpStream Web Page Showing – There has been a critical error on this website.

I’ve recently installed the Upstream plugin to Manage a new Project and wanted to install some of the premium addons, only to find this error message”

“There has been a critical error on this website.

Learn more about troubleshooting WordPress.“

displayed on their webpage.

Having spent a number of hours on this trying to chase the issue and reading some of these other forum posts, I’m a little concerned wether to continue, or wether this is a temporary issue. Can anyone shed any light or information on this issue, please.

Thanking you in advance of any reply.

The page I need help with: [log in to see the link]