Ticalc.org
I never used MirageOS, I always used Ion. Just go to that website and to the archives and you'll find anything you're looking for.
I can't believe it would require the graphlink. I'm assuming you're using a homemade one? The only thing that I ever needed a graphlink for was to update the calc firmware. All the rest of the files are .8xp, which can be sent using anyone of the programs made. I used CAL myself for a homemade parallel cable.