Relocate all files to folder checkbox unavailable sql server 2012
Try to do this with T-SQL:

restore database YourDatabase_NewName
from disk = 'C:\YourDir\YourDatabase.bak'
with
    move 'YourDataFileName' to 'C:\DataDir\DataFile.mdf',
    move 'YourLogFileName' to 'C:\LogDir\LogFile.ldf'
go