Questions
Q1
H81MGP2's driver on website most of them are CRC damaged, is there any fix to it?

Our website's driver download section has been test regularly to ensure it's able to download.

It might be 3rd party's software to block the software download or make it unable to download properly.

Try to disable the antivirus program and disable the download protection from Google Chome.

Then the driver should be able to download and install properly.