Backup restoration

hello, I am trying to restore a backup for a manager business on my my new system… but after selecting the back up file, manager tells me:
“This business database is not valid
Manager data is stored in SQLite database. However it appears the file you are attempting to open is not a SQLite database”

How do I solve this?

Please search the forum as this has been explained several times.

The solution is explained by the developer in this post.

See for other operating systems