This question already has an answer here:
I am unable to restore a backup from a 64-bit instance onto a 32-bit instance.
Microsoft SQL Server 2008 R2 (SP1) - 10.50.2500.0 (X64)
Microsoft SQL Server 2008 (SP2) - 10.0.4064.0 (Intel X86)
Error while restoring:
Restore failed for Server 'servername'
The database was backed up on a server running version 10.50.2500. That version is incompatible with this server, which is running version 10.00.4064. Either restore the database on a server that supports the backup, or use a backup that is compatible with this server.