http://lm.i2p/nojs/knowledge/network-upgrades
This has been the case for almost every Monero hard-fork, and the only continuation of old rules was by projects attempting to profit off of the hard-fork. While non-contentious hard-forks are the only way to properly upgrade important aspects of the Monero network, they do also have a frustrating side-effect – old software, released before the hard-fork was planned, cannot understand the new rules of the network and so does not function...