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You can't.

I'm pretty sure there's a massive disclaimer when you're attempting to download the 25Assist client for a Mac. It won't work on any new or newish Mac.

The client (and game) are built for 32bit x86 architecture CPUs. And while Macbooks used to run on x86 (before the M1), they haven't supported 32bit applications for years now.

EDIT:
To quote from the popup you get when triyng to download the MacOS client:

Assist is 32bit and won't work on the latest Mac OS (Catalina and newer) because those only support 64bit applications

So that means this hasn't been possibel since version 10.15 released in 2019.

I'm not entirely sure and certainly no expert, but it used to be possible to VM Windows on Mac, wasn't it. If so, that'd be your best option.

So you might be able to do that, to an extent.

But the problem is that today, an M1/2/3/4 MacBook runs on an ARM based CPU architecture. So all it can do in a VM is run Windows on ARM. And Windows on ARM does provide an emulation layer for x86 to run applications built for that. So if all that works (which is not guaranteed given the age of this game and other specifics), you'd be loosing performance in 2 places: first, the VM emulating Windows; and second the Windows on ARM emulation layer for x86.

The underlying problem here is that the M1/2/3/4 processors are based on ARM. Whereas the processors used by MacBooks before (by Intel) and the processors (mostly!) used by other PCs were/are x86. Those are two different instruction sets for processor architecture. While Apple was able to introduce an emulation for x86 applications (called Rosetta 2), these are only really suitable for native MacOS apps (which at the time were 64bit applications - like said above, 32bit applications were phased out before) and won't be extendible to run 25Assist (or AA).

PS:
If someone does manage to get M1/2/3/4 -> Windows on ARM VM -> 25Assist running, don't hesitate to post a thread about how that went. Or even if you try and it doesn't work - so others can potentially save time.

I'm pretty sure there's a massive disclaimer when you're attempting to download the 25Assist client for a Mac. It won't work on any new or newish Mac.

The Mac support AA 2.5 had isn't even compatible with old Intel Macs, it's for even older PowerPC macs. a CPU architecture that has been dead on the desktop since around 2005 when Apple ditched it for Intel and x86.