Updates and Servicing does not clean up EasySetupPayload folder once a new version is installed.
As the final step in Updates and Servicing, remove previous installer files for current branch builds and superseded hotfixes from %ProgramFiles%\Microsoft Configuration Manager\EasySetupPayload or add and enable a scheduled cleanup script/
Also there are now 3 locations with the full installation source files:
%ProgramFiles%\Microsoft Configuration Manager\cd.latest
%ProgramFiles%\Microsoft Configuration Manager\EasySetupPayload
%ProgramFiles%\Microsoft Configuration Manager\CMUStaging
This is true even with the latest version that I upgraded in a test environment i.e. 1810. Does Microsoft have any plans of correcting this or providing any documentation on why the 3 locations have the same setup files?