Solution which is a bit crazy.
1. Install iniManager on a computer that has never had it installed before (Computer1).
2. Locate the installed folder "C:\Users\your-username\AppData\Local" where it is called "IniManager"
3. Copy this folder to a USB-drive
4. Take the USB-drive to the computer (Computer2) that you want to install iniManager on where you have flightsim.
5. Copy that folder to the same "C:\Users\your-username\AppData\Local" on Computer2.
6. Run the program "inimanager.exe" and it works