Old version of KB2976978 is pre-installed on my Windows 8.1 pro system and cannot be uninstalled, but I do not install the newer versions of it offered by Windows update.
There are 2 telemetry related tasks under
Task Sheduler > Microsoft > Windows > Application Experience
which I kept disabled on my system, but after installing KB4462926 status of those 2 tasks changed to enabled and I had to disable them again.
Also after installing KB4462926, another telemetry related patch KB3150513 appeared as optional update among offered updates.
KB3150513 is only offered if newer version of KB2976978 (not too old version of it which is pre-installed on my system) is installed, but after installing KB4462926, KB2976978 still remains offered by Windows Update.
Does this mean that KB4462926 includes some different kind of telemetry than KB2976978?