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hOme.beardedDonkey - HOWTO Fix "Another Installation is in Progress" error when Installing Application on Windows 10
HOWTO Fix "Another Installation is in Progress" error when Installing Application on Windows 10 
There's various remedies for this, but this is what I did.

If you run Task Manager by pressing Ctrl + Shift + Esc it will load it as your user. If your user is not an administrator, you won't be able to kill the Windows Installer process, which is what is locking the installation out.

Run Task Manager as admin: in the Cortana/Search type "Task Manager" (no quotes) then opposite-click the Task Manager result it finds and select "Run as administrator"
Enter your admin user's password, press enter.
You now have Task Manager as an admin.
Click More Details and scroll down the list of processes to find Windows Installer.
Opposite click it and select End Process.
Wait about 20 seconds and try running your install file again.

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