I am also having a similar issue with NordVPN. In this topic posted earlier this month, it was suggested to install a package “libxml2-2”, but it seems it is no longer available in the repos.
Instead, I have a package libxml2.-16 with a version number 2.14.5-1.1 installed, yet, as per the previous thread similar to this topic, it seems NordVPN needs libxml2.so.2 to work.
It is somewhat clear that Tumbleweed moved completely to libxml2-16, yet, NordVPN still somehow depends on an older library.
Thus, any fix I could apply to fix this issue for now.
I am still waiting for NordVPN to get back to me so I inform them to probably update the app to make use of the updated version of libxml2.
(ETA: That’s probably the ‘earlier thread’ you mentioned, but there are solutions linked in that thread to a different piece of software (Viber) that has the same requirement)
It’s a little deeper, in a thread about Viber - installing libxml2-devel worked for the person here: Viber does not run after latest updates - or just manually creating the symlink as they suggested.
You can manually create the link to the libxml2-16 library per the other discussion - that should work. Otherwise, as suggested, provide the terminal output (along with the commands you’re running) to create the link.