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Why doesn't my 3d analyst work any more in ArcGIS 9.31?

Question asked by grosep on May 9, 2019
Latest reply on May 13, 2019 by MKennedy-esristaff

I operate a legacy version of ArcGIS 9.3.1 and have permanent licenses for several extensions (ArcView, 3d analyst, Spatial Analyst, and geostatistical analyst).  On May 12th  2018 these extensions were working.  Why do they no longer work?