Office 2013 or 2016 installation rollback problem with error 1935. Symptom : Getting error 1 935 and installation rollbacks. Solution 1 : Rename below mention windows registry key " HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\AppModel " to " HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\AppModelOld " Solution 2: Run " NetFxRepairTool " available in Microsoft website.