Hello Douglas,
My issue has been resolved. For others in a similar situation with Home Currency/login issues, here's what we did:
1. Create a new folder for extracting your backup .zip file (ex. Temp)
2. Extract the last good backup for SalesAnalysis to this new Temp folder (or in our case, the last complete Adagio backup while the software was functional)
3. Confirm if you can open SalesAnalysis by redirecting the data path from the normal location to the Temp folder
4. Optional: If it doesn't work, clear the contents of the Temp folder and extract an older backup .zip file from Step 2.
5. If SalesAnalysis will open, then copy all the SR**.dat files from the normal location to a new folder (ex, Temp2) and move the restored SR**.dat files into the normal location.
6. Open SalesAnalysis again and redirect back to the normal location. Login, retrieve OE sales data and run the data integrity check.
Thanks again Douglas, your advice really helped us

Terrence