Captivate 7 Trial Expired - Can I go back to Captivate 6?

Hello,

I am a Captivate 6 user who recently downloaded the Cap. 7 trial.  It has expired, and I am not upgrading at this time.  I have some Cap. 6 files from another company that I need to download, but every time I do they open in Cap. 7. If I try to save the files on my machine, I get the error saying if I save this file it will be converted to Cap. 7 and I will not be able to go back once I do that.  I have deleted all Cap. 7 files I can see on my machine, but do I need to do something else to uninstall Cap. 7? 

Any help or guidance to what I am doing wrong is very appreciated!