Hello,
CUSP 8.5(2) would fill the minimum requirement of CUSP 1.1(4), however it is not one of the recommended versions. It looks like 8.5(1) or 8.5(3) through 8.5(7) are recommended. Perhaps there is a bug in CUSP 8.5(2) that prevents them from recommending it.
The BOM does not say that it is not compatible, just that it's not one of the recommended versions.
-Jameson
-Jameson