I down loaded new OS X (Lion)operating system and discovered my CAD programs no longer run.  Is it possible to reload the original OS X and remove Lion?

I down loaded new OS X (Lion)operating system and discovered my CAD programs no longer run.  Is it possible to reload the original OS X and remove Lion?

If you backed up before the upgrade, restore the backup.
If not you are going to have to erease the disk and install the older OS.
You should back up any data you want before so that it can be restored afterwards.
Is there a version of you CAD program that is Lion compatable? That would be an easier solution.
Allan

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