Sql-server – Can’t restore backup from SQL Server 2008 R2 to SQL Server 2005 or 2008

I'm trying to get a backup from SQL Server 2008 R2 restored to SQL Server 2008, but when we try to do the restore we get this:

The database was backed up on a server running version 10.50.1092. That version is incompatible with this server, which is running version 10.00.2531. Either restore the database on a server that supports the backup, or use a backup that is compatible with this server.

I can use the script wizard to generate a script, but that takes over an hour to run. I also tried just exporting the data from server to server, but it had issues with the primary keys/identity columns. I will be running into this issue with several other clients so any help you could offer about how to get around this would be great.

Thanks for your help!