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It looks like Catalina is coming today. Apple rolled out the Gold Master of the beta yesterday. It's pretty snappy.
There are actually a lot of different ways to handle the older version of the Mac OS. I have an old 32 bit mac mini that I keep at Sierra for some programs that don't work with High Sierra. I also have an external solid state hard drive with Sierra installed on it, so I can simply plug that in, then boot off that. It works with both my iMac and 2018 macbook pro. Using virtual machines works as well.
The last 32 bit mac was discontinued almost a decade ago. Developers have been putting out 64 bit apps for longer than that. The problem is when you have old hardware or specialize hardware where mac support is spotty. The manufacturer of my weather station dropped their support for the software a while back. Fortunately, a third party supports the hardware with their software.
I probably need to purge my iMac of some of the old software that I haven't used in years.
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