I try to install it and it says it is not supported on the phone.
I have checked in the application manager and it is set to all so I cannot see that stopping it from being installed.
Does anyone know how to get it to install?
Or do I just have to wait for an updated version of it to be compatible with the N76??

You'd have to get a Symbian developer certificate and sign the .sis file yourself.

Easier, if you just go to http://www.drjukka.com and use Y-Browser instead (it is already signed).