If I lost an album or two, how can I get them back through iMatch, if they weren't purchased in iTunes?

I recently lost some albums and while the cloud shows that they are definitely not there, it gives me no option as to how to get them back. When I update iMatch over and over again, it doesn't download what was missing. I have everything turned on that I'm supposed to and I still don't get any downloads. I can't re-rip the CD since I sold it last year after I got iMatch. This is rather frustrating ....