After Installation problems

Hello,
Downloaded and Installed the "Portable apps Platform" 14.4.1 on a memory usb stick.
After installation finished, I did not select any program to install, Downloaded the "LibreOffice 5.4.1 Multi",
from the platform menu selected to install a new app - "LibreOffice" from the downloaded file.
After long installing time it was finished. Did not do anything with the installed program, wanted to eject the usb
stick - could not, it said searching for update, waited for almost an hour and still refused to eject the memory stick.
In system's task manager I clicked on "End task", only then the icon in the taskbar gone.
What is wrong ?
OS is win 10 pro
Answers will be much appreciated
Thanks
Motim