I must be having fun, because time got away from me. I have two mediawiki sites that I support. One was dutifully upgraded to 1.28.2, but somehow the other one got overlooked and is sitting at 1.26.2. Looking at the varied upgrade files available, I'm not sure there is a safe route from 1.26.2 to 1.29.2.
Pointers would be most welcomed.