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What made the difference was the availability of Parallels to run OS X and Windows concurrently, to use one accounting program which is not available for OS X. So now I'm about one month into the OS X learning curve and so far very impressed with this elegant operating system. I have used MS operating systems exclusively since the DOS/Windows 3.1 days and could never understand the attraction of the Mac. I then installed OS X 10.10 over top of 10.9 and so far everything is fine and boot times are back where they were originally (20-25 sec). A few seconds later the update completed and PD10 continued to work well. PD10 then popped up asking to install update 28600 which I accepted. Today, HDD was wiped and an OS X 10.9 image was restored. The subsequent pop-ups requesting I update PD10 lead to a PD9 link (?) and then to a PD10 link which was "Dead". After a re-boot everything appeared to be good except PD10 would not start. If youre told that only apps from the Mac App Store or registered developers can be installed, your app isnt Developer. The team identifier is the 10-character alphanumeric string.
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In macOS, an Apple system library is a library shipped in /System/Library. The now "Empty" 10.10 partition was erased and the original 10.9 partition expanded. In iOS, an Apple system library is a library that Apple mastered into the OS image. The 10.10 core storage volume was reverted to HSF+ format and its data, block-copied to the 10.9 partition. After about a week I decided I would switch to 10.10 permanently.
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Originally I had OS X 10.10 installed on a second HD partition, dual booting with OS X 10.9.
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