Ian - Thanks for the feedback.
As long as the Events and Projects folders are renamed, no version of FCP X will "see" them.
When you update FCP X it overwrites the original one in the Applications folder.
re the last sentence: "Tell me about it". 😉
One reason I've been so cautious is because after I re-named the X.9 version as "Final Cut Pro X 9" and downloaded the new X 10.1 (X.1) version, it replaced the old X.9 version. Apparently the re-naming wasn't enough. Perhaps the X.1 update lookd for and found the "Final Cut Pro X" part in the re-name and decided that was enough and replaced it.
This time, though, I re-named it as "Final Cut Pro X9" and moved it to the second hard drive (see screen shot in my previous post). When the new X.1 version was re-downloaded it didn't replace the re-named X.9 copy. Life is good now. But, the next part is dealing with all the X.9 Projects and Events, PLUS, I still need to be able to edit with the old X.9 Application.
Pardon moi if I'm VERY skittish at this point.
With regard to your next comments:
You cam then drop it back into the Applications folder where it will sit next to 10.1, ready for immediate use.
As a belt and braces person I also keep a copy of it on another hard drive ............. I even burn it to a DVD.
Currently (as mentioned earlier) the X.9 version is on the Hard Drive while all the other applications are on the SSD. I'll give the first sentence (above) a try because it would be much better having it on the SSD drive.
After the new X.1 version is up and running (I've yet to add a project to it's Library - that is the next thing), I'll give it a try moving it over to the SSD. I do have a copy on my MBP laptop and on my portable drive so no shortage of copies. The old Event and Project folders are something else again - they are HUGE. The worst case situation there will be as bad as having lost my hard drive several years ago. Talk about learning the need to do back-ups the hard way!
The "burning it to a DVD" idea sounds good. That would free up some disk space. Getting some of the edits finished on my old Projects so they can be burned to DVDs will also be good, that way even more disk space can be freed up.
I know Jobs & Co. would like to rent space in the Cloud but I'm not ready to go there just yet. DVDs are cheap and easy so even making duplicate copies is do-able.
Thanks for the DVD idea. Hadn't thought about that. Guess I was too mired down is trying to get things updated.