Yes, you can have different versions of Cosmoteer as long as they are installed in different locations.
When you say "I couldnt open it", what do you mean? Do you get an error?
You might want to check if it's blocked by windows or antivirus. If it can't write to the user account for example that could also stop it I think.
Both versions were in the same place. Its fine now. Thank you for your help!
