Now i cant uninstall ver 7 when i try to install ver 6.3 It will automatically try to install ver 7 which does not work

[nukecad]

You need to turn off Automatic Updating when you are installing v6.39, follow the instructions given in this:

How to Roll Back from v7 to v6.39

We now have numerous posts from users dissapointed with the new v7 and asking if/how they can roll back to v6.39. Whilst normally I would say that you should use the latest version that works on your machine I also believe that you should have the choice to roll back from a major feature update. Particularly if/when that update is flawed. So here is how to do it using the official v6.39 installer (so that you don’t have to download a possibly dodgy* v6.## installer from a 3rd party website): …