Cannot update to 3.5 on older MacPro and 3.5 not compatible with 3.4.5

It appears that you cannot update Aperture to 3.5 on older Macs. Worse yet the new update is not compatible with the previous version.
The questions are  ---
Is this a temproary issue or a permanent issue?
Can I regress back to version 3.4.5 to get my compatibility back ?
I have multiple computers I use to work on my photography.
I use a older Mac Pro Vintage late 2007 that cannot be updated beyond OS 10.7.5. This is currently my primary photo computer.
With 3ghz Quad cores and over a terabyte of drive space no need to update yet except for not being able to load the latest OS.
I also use a MacBookPro Vintage Late 2011 and it was just updated to Mavericks. I use this to edit my photos on the go.
I will consider updating to the latest Mac Pro when it becomes available but what to do until then and a warning to others.

Actually, I had this same problem - accidentally upgraded my library on my Mac Air to 3.5, but am not running Aperture 3.5 on any of my other, older Macs.  I *was* able to downgrade the library back to 3.4.5.  BAsically, I had to open the library on a computer running Aperture 3.4.5 in library repair mode (holding down command and option when opening).  In the ensuing dialog I had to choose to rebuild the library.  I first tried just repairing, and it seemed to work, but next time I opened Aperture I got the "library can't be opened iwth an older version of Aperture" message.  Rebuilding it seems to have done the trick.
A more detailed explanation (though not written for this particular scenario) is here:
     http://www.apertureexpert.com/faq/common-aperture-questions-issues-and-rep/how-d o-i-repair-or-rebuild-my-aperture-library-or-permission.html
Having restored the library to 3.4.5 format, I downgraded Aperture on my Air to 3.4.5 as well and it's been smooth sailing.  Just make sure you have Mavericks set up to *NOT* automatically update your apps, or you'll end up in the same situtation all over again when it silently upgrades Aperture to 3.5 again.
Good luck!

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