You can look at Warrior 7 data using Warrior 8, but you cannot modify it in any way.
However, you change scales or recalculate passes from a Warrior 7 database after extracted the log pass into the new Warrior 8 database.
To extract log pass from Warrior 7 database to Warrior 8 database, follow the step below courtesy of Jerry Early.
go to Warrior 8 Database Utilities -> Extract Pass(es) to a New Database. Choose the Warrior 7 database, Choose pass(es), and then give it a new Warrior 8 Database to put the selected passes into.
You can click Here (http://www.warriorsystem.com/public_download/Warrior_8_Support/Warrior%208_Extract%20Pass%20to%20the%20new%20database.pdf) to download or view the Extract pass to a new database guide.