Installer: temporary files are not removed when window is closed

1. download installer exe
2. run DeveloperPlatformInstaller*.exe
3. when installer's window opens, close the window
4. look into C:\Users\yourusername\AppData\Local\Temp

result:
Temp folder contains several files and directories with name starting 7zS, with total size of about 1.7GB, when you open start the installer multiple times, it appears multiple times in Temp