Many things changed with cavalry. The full archer animation of Hatamoto and CavArcher needed more space than was possible with just using the custom folders 0 and 9. Also some HCav and Hatamoto fighting and running anmations were left out. Some weapons (YariCav and NagCav) have changed because there's more space for them now. etc, etc.
Beta_5 doesn't touch any of the existing vanilla animations and it's still possible to play vanilla. With beta_8 we overwrite the vanilla files and have more space to include all the necessary animations.

If you can get everything running but the Cavalry animations then we know what the problem is.
If that is so, I think barocca will be able to solve that and it seems he'll be back soon.

R'as