Here's a Windows command line port of the official assembler the dev made a few months back, for those who can't get the Python version to work. From Arkia on Discord DM's: "Alright I did it. I wrote a real assembler in C. It works exactly like the python script does and cleans up a few very strange things I discovered while porting it (but still keeps some I'm too lazy to change)"
Also, if you want to toy around with a formerly-unreleased version that has a 4-channel PSG, an updated renderer that allows for stuff such as mid-line palette changes, a "Get Stack Pointer" instruction, some updates on the software side, some unfinished stuff that (indefinitely?) halted CHROMA-60 development, and some strange crash bug I don't know what could be the cause, check out this Twitter thread! I'm hoping someone could make a tracker or something on it!