Hmm... seems its not available for free download :-( Good luck finding a copy.. I'd sell you mine, but I still play it occasionally, so ;-)
As for those games, wow thats a blast from the past. Yeah, I wrote them in Amiga E years ago.. 5k Space Invaders is surprisingly fun, yes. But 6k Pacman is fatally flawed; its possible to remove a dot without it registering as "eaten" so you end up with invisible dots which you have to blindly find to finish the level ;-)
I could make much smaller versions these days as my 68k assembler skills are much better..
Glad you enjoy them, anyway!