Can't see/use "Decision Tree" operator

cl_analytics

I'm trying to apply a "classical" decision tree, but only see 6 options (instead of the typical 8) under Tree operators: CHAID, ID3, Decision Tree (multiway), Decision Tree (weight-based), Random Tree and Decision Stump.  I've tried installing versions 9.7 and 9.8 of RapidMiner Studio, for 32-bit and 64-bit systems (my machine is a Windows 64-bit PC), but still can't find the Decision Tree operator.  How else can I run a classical decision tree? Any help would be much appreciated.

cl_analytics

Update: RESOLVED - My Rapidminer was in safe mode because it kept crashing earlier.  I went to settings and enabled "initialize extensions" at start-up, and was able to use the "Decision Tree" operator.