@KitaYama are you at least able to revert to previous versions?
It's not impossible, but very hard to maintain. Recent CAD systems come with SQL Server database as a file manager. The most used system is PDM. When we create a new design or a new assembly or part, we have to save them in PDM. They manage the security (who can access, edit, view) plus they also manage the drawings revisions and the version of software they've been worked on. So going back to a previous update is not as easy as Office. A whole system should be revert.
As I said, it's not impossible, but for example for our company with 10 seats and 15 engineer, it may take several day. And it stops the manufacturing line. Most personal on the line, use eDrawing to view drawings (instead of printed drawings). If the system is under maintenance, no body has access to the drawings and designs.
We prefer to use work arounds instead of revert the version. Why? because we really don't know if a new version works or not. As I explained there's been several patches and service packs up to now to correct the case, but they didn't.
Imagine with each service pack, we upgrade, we recognize the problem exists, and we uninstall the service pack. How many times we can go this rout?
For most companies I know, using back doors and work arounds is better than stopping the production line.