The database was backed up on a server running version 8.00.2039. That version is incompatible with this server, which is running version 11.00.2100. Either restore the database on a server that supports the backup, or use a backup that is compatible with this server. (Microsoft.SqlServer.SmoExtended)
I am trying to restore and I get this message.. is there anyway to restore this backup without having to install SQL Server 2005?
SQL Server 2012 (v11.0) doesn't support direct upgrade from SQL Server 2000 (v8.0).
You'll have to use a "in-between" step restoring your SQL Server 2000 database to a SQL Server 2005 or 2008 instance, and then do a backup from there, in order to get your .bak
file into the latest database server.
There's no trick or workaround for this - that's just the way it is, and you'll have to deal with it.
There are tons of blog posts on this topic, e.g.