The "Windows Desktop application" is still being offered in the Microsoft Store.
It has NOT been "temporarily removed to prevent syncing issues".
Perhaps you meant "the Verizon messaging servers were blocked from sending SMS text down to any Windows client" at some (secret, unannounced) date?
We've all known about your web-based "Verizon Messages" option. Very poor replacement for the Message+ app.
We'll all look forward to the "Message+ team" developing a "resolution".