Hey there,
I had a trial version onf photoshop CS6 on my computer and I wanted to continue my subscription. I have tried to download CS6 again via the creative cloud and it only allows me to update it. I am assuming that is because it still thinkgs I have the program on my computer but I can't find it anywhere in my applications folder and remember trying to delete it. I think I may have deleted it incorrectly and now I don't know how to fix it.
Thanks!
There is a system cleaning tool, and advice here
http://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems.html