First off maybe it's a problem with the FH file on the download server being corrupted etc, since things have happened here before with the Feral Heart download link not working and stuff the person(s) who downloaded the file might have to replace it before you can use it. Sometimes a temporary mess up in your Internet connection or the internet connection from the download server can cause the file to become "corrupted" so always try the download again just in case

.
Here are a few things you can try since you're getting that specific error message:
1.) Delete all temporary files in your cache
2.) Make sure that any security/antivirus software is disabled during the install. This includes Windows Firewall.
3.) perform a system update
4.) (Probably unnecessary since you said this is a new computer) You sometimes need to delete and uninstall the previous/leftover files of the Feral Heart folder before getting it to work smooth again before doing a clean install.
5.) Sometimes rebooting your router can fix this problem
If I think of anymore more possible solutions I'll add to the list
Hope at least something here helps. Goodluck.