Now, since everybody seems to be multiposting these days… This is what I said in the other related topic:
I can confirm what slomacuser says. I just try to install 7.5.3 from the floppies images found on the so-called Legacy CD Rar. It went just fine in Mini vMac. Disk Copy does indeed think image #8 has a bad checksum. Then what? Just mount the image and skip the checksum test! It's just that easy, really.
Note you may want to set Mini vMac emulation speed to 1x before mounting the image, in order to have the time to click on "skip" before it's too late!
Anyway, I posted the Mini vMac 7.5.3 .dsk 24 Mb image I just created (standard installation on a virtual Macintosh SE, no other software). Hopefully that will reduce the number of multiposts about System 7.5.3 around here, since IMHO it's one of the crappiest OS released by Apple. Basically useless since all Macs capable of running it can (and should) be upgraded to 7.5.5, and those who can should be upgraded to at least 7.6.1. Just my two cents, though!