You should always keep one machine with high sierra. Since Mojave and Catalina requires some updates of high sierra.
if you install Mojave in your machines you can run 32bit apps which is the last of Mac OS to allow it. Also it requires afps format so does Catalina.
if you want the feel of all different OS then keep all 3 . one each in respective machines.
It is all matter of choice. Catalina is a bit troublesome but if you get all going then it works like a charm on unsupported machines. Except you may have to do away with airdrop or hands off depending upon what wifi/bluetooth card you have.It only works for broadcom cards.
Since you have photo library on external usb stick there should not be an issue opening it in any of system. You can just press option while clicking on photo app and selecting the library.
Rest since the choice of OS is subjective its best for you what you like. cheers
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Thats wonderful
@dosdude1 . Cheers
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Tks
@highvoltage12v . Wonderful for imac 2011 upgraded mxm cards such as we having these blank screen issue. Could you provide the link to the patched ktext file. Tks
