If unfortunately Guitar Pro 7.5 crashed unexpectedly prior you had a chance to save your work in progress there is a big chance that you can recover this specific file.
Simply copy and paste the following address into Windows file explorer:
More than likely your file will be saved into the "Backups" folder as highlighted in the pic below.
Feel free to also have a look in the "Autobackups" folder to retrieve your file if necessary.
Open your Finder
Select the Go menu
Select Go to Folder
Copy and paste: ~/Library/Application Support/Arobas Music/guitarpro7
Check the backups and autobackups folders.