Hi,
There were patches available for SUPEE-8788 to download this morning for all versions from 1.5+.
We downloaded a patch for 1.6 and it wasn't working, and now the patch has been removed from the website.
I wondered if there was any ETA on the patch release please?
Edit: I've just found https://community.magento.com/t5/Security-Patches/SUPEE-8788-AND-SUPEE-1533-Incompatible-Hunk-error/... - which looks like it may explain it.