At the end of update check, "elevated process" is invoked and remain alive after update check has been done.

I created installer for my program, and after installation successfully done, invoking

maintenancetool.exe --checkupdates

invokes elevated process on its ending.

and started process (maintenancetool.exe --startserver) keep remain.

(The checkupdates task was invoked by an user who has Administrator rights.)

This was caused by destructor of PackageManagerCore class.

At the destruction(created as local instance of UpdateChecker::check() method), PackageManagerCore create VerboseWriterAdminOutput, and write() method of this class invokes "elevated process".

and this process remain running in the system.