If there’s no arm64 deb, then it’s VERY unlikely there’s an arm64 snap, app image or flatpak… not just VERY but probably EXTREMELY unlikely.
I run into this all the time… well not all the time, but often enough for it to be a PITA.
I mostly run Ubuntu 21.04 on my Pi4 systems (I do have a headless Pi4 with 4 GB RAM running Raspbian Buster arm64/aarch64) - because I loathe the foundation’s Pixel desktop it’s butt-ugly, and retrofitting XFCE4 onto arm64 Raspbian is also a PITA, and it’s always an ancient version of XFCE, so I’ve gone with Ubuntu 21.04 running Gnome, and I find it more usable than Buster running XFCE, and I get kernel 5.11…
Just getting armhf binaries working on arm64 can be hairpullingly frustrating… e.g. on armhf raspbian, I can install steamplay (to stream steam games from a remote computer) simple as “sudo apt install steamplay”… If I want to do that on Buster arm64? It’s like a 1-2 hour process, installing multiple libraries and armhf libraries on top of arm64 (and one time - doing this, not sure what happened, but it decided to REMOVE all the arm64 versions of libraries and make my Pi unbootable).
If you can’t find binaries - then I’d suggest your only option, if its OSS, grab the source code and compile it. That’s what I did to make Sayonara play on Raspbian Buster (but it turns out, Canonical include Sayonara in 21.04 arm64!).
There’s one thing I kinda / sorta need - I bought a PiJuice Hat (it’s a “hat” that sits ontop of the pi, and it has a battery - it’s essentialy a UPS) - but - the vendor software does NOT play nice on anything but armhf… So’s I’m planning on running Kali on this (tried once, but when I tried to sync it to my cloud solution - it zeroed half my shit). I’ll probably try Kali (arm64) on this Pi4 again, from scratch, and then try and get PiJuice running on arm64 - because that’s the whole point of Kali really, that it be quite small, and portable… I still can’t believe the Pi Foundation are too stingy to include a LiPo battery charging circuit on the board - there’s plenty of room, and Banana Pi can do it, and Orange Pi, and NTC CHIP, why not Raspberry?
TL;DR - sorry for hijacking your thread…
What @Akito said - read their github page, and try running it from source, that’s your only option really… I’ve no use for this software, but I see the Mac binaries are probably for Intel, which may, or may not, work (using Rosetta) on my ARM64 Macbook M1…
On that github page, there’s link to a “Builde Guid” for arm/arm64 :
Then link to here :
With a big DOWNLOAD button to get some kinda zip file…