This is 32 bit software, originally written in the 1980's. It is known to work on Linux and 32bit Cygwin. On MacOS (Catalina) it will compile but not run as 32 bit binaries are no longer supported. The changes necessary to enable Miranda to compile for 64 bits are under study but are not straightforward. To be notified of new versions put yourself on the mailing list.
The software comes without warranty, see the file COPYING in the source directory. But you are welcome to report bugs, installation problems or other comments to (see note on spam).
Here are some older binary versions:
The Windows version of Miranda requires Cygwin to be installed first, with these components.