This site -> Bottom -> Choose Country -> Peerguardian2 txt file -> Download
ip2location.com/free/visitor-blocker

Download Peerblock 1.2. But be carefull where you download from. (I Download from Filehippo or peerblock.en.uptodown.com) Scanned with [scamadviser.com/VirusTotal.com]

Careful you don't block Facepunch ;)

Does not work as expected. The plugin blocked nearly everyone on my server.

{
"AdminExcluded": true,
"BanInstantly": false,
"CountryList": [
"CN",
"RU",
"SK",
"TR",
"HU",
"CZ",
"TR",
"AU",
"PT"
],
"Whitelist": false
}

The Plugin blocked DK/DE/SE...