Vintage Apple Mac software can be downloaded free from the AppleMac website
info dot apple dot com slash support slash oldersoftwarelist dot html
This shows a very long list of vintage software available for free downloading, and about halfway down is System Software Downloads, including system 7 5 3 to go on 19 floppy disks, and masses of other stuff too.
Thankyou for reading my guide, I hope it has been useful.
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All the best from Ebay member 12mandy