It looks like they have removed any reference to the old Viva Connections (Desktop) in the documentation. Original link:
https://learn.microsoft.com/en-us/sharepoint/viva-connections-desktop
As early as 3/2, that link had instructions on downloading Viva Connections (desktop) for Teams. That link now redirects to a Viva Connections overview page. It seems the download page still exists:
Download Viva Connections for Teams desktop from Official Microsoft Download Center
Anyway, does that mean the old version (which I guess is just a website wrapped in an app wrapper) is no longer supported?
Edit: Here's the page I'm referring to (courtesy of WaybackMachine): Add Viva Connections desktop to Microsoft Teams (Desktop only) - SharePoint in Microsoft 365 | Microsoft Learn (archive.org)