Sorry to hear about the predicament.
I am not sure this will help as I am on MacOS and iOS AND does backups (especially versions of this folder).
I frequently store complete versions on and off line of:
/Users/NN/Library/Containers/com.shapr3d.shapr/Data/Documents/workspaces
Maybe you can find an equivalent path in Windows in a backup.
(To restore just a specific previous workspace I find the one I need in the folder (some clue is in the folders and time stamps). Then go off-line for safety. Copy the found one like 0c867574-e2a4-4607-8d4f-463c721c8de0 an alter some singel character to get new workspace. Starting Shapr now gives a recovered “untitled project”. Earlier I had some success with importing just a file after renaming but that does not worked last I tried. And a complete workspace-folder restore feels anyhow safer.)
/BK