There is a release of Litter Power Pro that is compatible with Max 6.1 and up. Please contact me if you have a Pro license (I have a list of license holders, but I don’t have the handles people use on the Max list).
I am afraid that the current version of the Litter Starter Pack will not work on Max 6.1 due to changes in the SDK. Having figured out what needs to be done for the Pro version, it is not terribly hard to fix, but I have unfortunately not had the time to invest in updating the free version.
In general, the best place for information and questions about Litter Power is from the Litter Power web site (as ever, http://www.bek.no/~pcastine/Litter/), or direct email to the developer.
juste send you an email but I am not sure if I have the right address (I had Two, one is not working anymore, maybe the other)
So yes, I need (or want to? no, need !!! ha ha ha) to have Litter on max6.1 (etc, the latest)