List log for recommendations to use iGP Manager:
Windows 10. Windows 10 should be good to use these days to install iGP Manager.
Windows 8.1. Since 2013, Windows 8.1 is easier than 8 and is a good alternative to 10.
Others:
Windows 8. In 2016, it was now in the end of support stage. 8.1 is recommended as it doesn't have vulnerability issues with downloading and viruses.
Windows 7. Ah, the legendary OS. It's out of support and you shouldn't download iGP. Upgrade to 10 for faster downloading.
Windows Vista. Since 2017, Vista is out of support and 10 is faster to download efficiently.
Windows XP. Since 2014, it was also in the EOL stage. 10 is faster.
Don't use 98, and 95 because they are in the EOL already in 2001 and 2006 respectively!
This is a guide for PC users new to iGP Manager and what OS is good to install it. This might not be correct.