I tied v5 on my dell n5110 with an ALPS and it partially works. Touchpad works, prefpane loads, but no multitouch whatsoever.
Before this, I was using a driver made by florin9doi which worked with multitouch but was too sensitive and the pointer kept jerking on the screen by merely touching the trackpad, even without moving my finger.
He gave up on the driver but released sources. It'll probably be of some help getting older APLS working.
https://mega.co.nz/#!XYhDmajQ!DsgiLw9SdVTa1RpeGag8sD61DGp6S_UwkwLY7BF6D3M
Good Luck and hope to hear some good news soon