captainbarner
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StepUp mod allows you to walk up one block height without having to jump up. If your character cannot walk up blocks on a server with this activated, deactivate or you could get a ban from that server for “hacking”. Press “J” to activate and deactivate the effects ingame. The keybind can be changed in the controls menu.

Download: http://www.9minecraft.net/stepup-mod/