Mods not working

[ItsGvidas]

So i have downloaded a mod that if you break the bottom of the tree all of the wood falls so when i try it its good but when my friend tries to chop the tree it doesnt work. He was already an operator on my server 

[ItsGvidas]

pizzaatime's Timber Mod

[ItsGvidas]

but its working at my server im playing on the server and it works but it doesnt for my friends

[ItsGvidas]

u mean installed in the computer? cause if yes my friend doesnt have it installed but its a different Timber mod so im confused

[ItsGvidas]

well im on Aternos.me and downloaded the mod for the server and it worked for me but not my friend

[ItsGvidas]

he just installed it and its not working for him but it is for him

 

[ItsGvidas]

i meant its not working for him but it is for me gosh im dumb

 

[ItsGvidas]

how do i know where to contact him