Installed a copy of OJS from their site into my account on hcmc/home1t with backup of those files on my Mac.
Separately, downloaded the ojs and pkp-lib repositories from their github site. Not sure I'll ever do anything with those, but I've got them just in case.

Plan is to do investigative work with my autonomous copy (have a backup of the tar.gz file so that I can expand that and compare with changes I've made) so I'm not constantly having to deal with whatever changes they're making. Then I should be able to either manually migrate those to my copy of the github repo and then PKP can deal with them from there, or come up with some other way of getting my modifications to them.