We recently purchased 14.0 PE+ upgrade with the intention to run it alongside version 12.0 PE+. Version 12.0 works fine until version 14.0 is installed. Then 12.0 will no longer open a new drawing or an existing drawing.

Is it not possible to run two versions on the same PC anymore?

In the past we successfully ran 9.x and 11.x on the same PC.

The view counters in this forum seem to be misleading. A post like this one has over 4000 views but no replies. Is this forum actually very active but nobody bothers to post anything?

Not sure about the forum activity.
I used to have versions 9 through to 12 all on the same PC, however since 13 none of the earlier versions work (I have the same problem as you)
In the past I have found that I could re-install an older version to regain functionality, but this no longer works as there is a 'new version' check that blocks
the install.
Though 13 & 14 do work atm.

Thanks @sln8458, at least I now know it's not a problem on my end.

I am facing the problem in Windows 10 update. Any Solution

Juliaacorney wrote: ↑

Wed Dec 17, 2025 8:31 pm

I am facing the problem in Windows 10 update. Any Solution

To ensure system stability, we advise against installing multiple versions of CMS IntelliCAD (such as v12 and v14) on the same machine simultaneously.