Unfortunately, trying to make Mineways platform independent sounds like a giant amount of work to me (especially since I know very little about it. I guess I use Qt and...?). And, exceedingly dull work - Mineways is a hobby, so I do what I think is worthwhile, with a focus on cool graphics. So, I won't be making a Mac version at all.
I do mention some other options for running on the Mac here. From what you're saying, they're dated now, but you might give Crossover a try - at least you'll get to use Mineways for 14 days, if it works. Please do let me know how things go - your experiences can help a bunch of other users (Mineways gets around 500 downloads a day).
What I did during the pandemic... Today I'm happy to release a major update to Mineways, 8.0. The program now can read in physically based resource packs (after some prep) and export to the USD format. These exported models can then be read in by Omniverse Create, a free program in beta. Release notes here.
New version of Mineways, 8.02. A number of worthwhile fixes, such as stair orientation's been fully updated to the 1.13+ file format and exports now show some statistics when done. See the whole list here. I also added LunaHD and Smoolistic as PBR resource packs, for USD export, and support for the LabPBR format. And, for you Houdini users, Vochsel (github name) added a beta of UsdPreview materials. Once these materials all work well I plan to add a tutorial for Houdini Apprentice, which is free.
And, if you're eagle-eyed, you'll notice something funny about one of those numbers... fixed, and new version uploaded.
Mineways 8.03 is out. This version has a quick patch so that newer beta snapshots of Minecraft don't crash Mineways. Note that 1.17 blocks are not supported - they won't be until 1.17 is officially released. But, at least things won't crash. For snapshot 20w49a and newer, 64 is added to the world's height, so that the now-deeper underworld is handled. This means Mineways Y coordinates for these worlds is displayed incorrectly, until I come up with a full patch. As important, "only" 256 levels, Y=-64 to Y=191, for beta worlds will be displayed. Anything higher is ignored.
I also added a command to toggle water off and on quickly, for you undersea explorers. JG-RTX has also been updated, including nicer plants, rails, and more.
Version 8.06 of Mineways is up, with a new mapping mode to show chunks, export of instances to USD, and a lot of little fixes and cleanups. Plus, a new version of JG-RTX, the nice physically-based rendering resource pack.
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Hey, I was wondering, I use an iMac and Mineways is my main source to import worlds into Cinema4D for my animations, it sucks because my Mac is updated to MacOS Catalina and now it's not supported, Wine also doesn't work and I don't have any other computer to properly export worlds for Mineways, I hope if there is way for me to still use Mineways on my Mac but if not could you please, I beg you to make it compatible with MacOS Catalinas 64-bit application support. Thank you.
Mineways 8.08 is up. I fixed a major biome bug, due to my own sloppiness in leaving some debug code in the release - everything was looking like a swamp biome when you turned biomes on. Oops. Main feature added is that you can now "Focus view" in the View menu, which lets you immediately go to some distant location instead of having to do lots of scrolling.
Next release should include Minecraft 1.17 blocks (of which there are 122 to add...).