I am currently running Cs6 on my mac pro, i have several G4 machines sat doing nothing so i thought i may use them in a render farm connected to my mac pro.
How do i install the render engine on the old machines? My Cs6 installer doesnt seem to work
G4's are running Osx 10.2.1
You can't. AE hasn't supported any PPC processors ever since it went 64bit and that is now already6 or 7 years ago. Your G4s realyl are nothing more than decorative screap. Sell them on eBay. Some people build aquariums/ terrariums from such stuff or some case modder may want to use it for building a fancy new PC in disguise...
As Mylenium says, After Effects CS3 was the last version to run on PowerPC processors.