It is more appropriate to leave this in its own thread.
As far as the issue, your problem isn't completely clearly described. However, make sure you've installed the latest version of MC 20. The easiest way to do this is to download it from this forum using the thread you just replied to (the one for MC 20.0.29). Download and double click on the disk image (DMG) file. Then in the window that appears, drag the MC icon into the Applications folder icon to install it.
To be clear, you CANNOT run the application directly from the DMG file. There is no installer. You just drag it into the Applications folder, as is common for Mac apps.
To restore your license, please read:
http://wiki.jriver.com/index.php/Restoring_a_LicenseMC did not put your application in the trash. I'm not sure what is ending up in the trash, though I'm guessing it might have to do with the DMG installation process.