compatibility between NIS 2011 & Spysweeper 6.1.0 (build 145)

I have been using Spysweeper 6.1.0 (build 145) along with NIS 2010 for some time with no apparent interoperability problems.

 

Today I installed NIS 2011 and was prompted to remove Spysweeper before installing NIS 2011.

 

 

Question

Is here a true compatibility issue?   Or can I now re-install Spysweeper?