Please read this update note carefully. Your current jumppad settings will most likely not behave the same way as with previous versions and needs re-configuration.
Launch Computation Revised | The launch computation in the prior versions was not very well implemented. The launch velocity was highly dependant on e.g. the angle. Those should not affect each other. E.g. changing the angle should merely make the parabolic curve steeper and reduce the launch length, however, it increased the final velocity launching you farther. It was discovered by @Rocket32 that if you created a jumppad with /jp create 1 90 i.e. a jumppad with power 1 and angle 90 it would launch you sky high even though the power was only one.
Enough rambling. The launch computation in this update has been totally revised and now reflects your chosen settings and parameters without affecting each other other than what you'd expect. The result of this is incompatibility with previous settings. Once you've replaced the jar you should check if your jumppads still launch correctly; if not then re-configure them.