how do I uninstall adobe cs6 and re install it

I had to wipe my mac's hard drive. When I went to put CS6 back onto my computer I dragged it from my external hard drive. Now every time I try to open one of the programs I am being told to uninstall it and reinstall it via error 16

When I went to try and find the uninstaller it doesn't show up on my utilities. Is there a way I can reinstall it onto my computer. I do not have the original external hard drive with me as i am out of the country and I do not have the download. Is there a way I can get the download again since I only have the software on one computer?