I run two versions of Designer with no problems. I just use the most current one to download to the memory card.
I use the original vers. 1.113 I got with the Compucarve since it has a feature the newer ones don't.
I just install the current version to a different directory. Now I have two shortcuts and can choose the version I want.
Just remember to only use the version that your memory has been flashed to.
Art