elgg 1.8 --> 1.7

Hi,

is there any documentation about how to change plugins working with elgg 1.8 to work with 1.7? I want to use elggpad. http://community.elgg.org/pg/plugins/release/825454/developer/efault/elggpad

...on elgg 1.7.7. Or is there any way to use 1.8 plugins in 1.7 without having to cange the whole code?