This problem here is that Apple dropped native support for 32-bit binaries in Mac OSX v10.15 (Catalina).
Several workarounds for running 32-bit apps have been mentioned on the
web. I haven't tested them.
If you try any of these, please let me know
how it turns out so that I can update this page with better advice, thanks!.
Docker
Docker allows you to run a true, native Linux
under OSX:
https://www.raywenderlich.com/9159-docker-on-macos-getting-started
This looks like the ideal solution because there are many compatibility issues between Linux commands and software under OSX, and this should solve all of them, not just usearch. Docker is free, unlike the commercial packages mentioned below. Under Windows, Docker is very fast to load and seems to enable a comprehensive Linux environment in initial testing.
VirtualBox
VirtualBox is an alternative to Docker for
running native Linux under OSX. It is also free. In my experience on other
platforms, Docker is much better.
Partition
According to Apple, you can partition your
Mac so that it can start with an older version of OSX as well as Catalina:
https://support.apple.com/en-us/HT208891
Commercial packages
According to
an article in PC Mag, you can use
Parallels
Desktop or
VMware Fusion to install older versions of OSX under Catalina.