Hi,
My operating system is Linux Mint 21.3 Mate (based on Ubuntu 22.04).
I run Smath Studio Desktop version 1.4.0.9654, with a fresh (new) configuration.
I face a problem of "Server connection status: Trust Failure".
It prevented me to register online (personal license), so I registered offline.
Once Smath launched, when I launch extensions manager, there are some extensions available in memory (delivered with Smath); but when I want to download extra extensions from the online gallery I receive again the "Server connection status: Trust Failure" message and I cannot see what are the extensions available in the gallery:

Note that nothing prevents Smath to connect to internet. The problem seems to be on the server side.
Regards,
MN