Months ago I installed Zorin on my computer but I didn't check the integrity of the ISO file (I'm quite new in computer building and GNU-Linux, sorry). Well, now I've compared the numbers of the checksums and they don't match at all.
The version I Installed was Zorin-OS-16-Core-64-bit-r1.iso. The actual one is the r4, I think. Do checksums change between older and newer versions? If not, what could happen if I installed a corrupted ISO file?