This allow to quick deploy wireguard configuration to mikrotik routerboards. You can create your own config visiting the website: https://markeclaudio.github.io/mikrotik-wireguard-config-generator/
This is a Google Chrome limitation, you can use Firefox to download all files at once.
However in the latest commit you can download all the files inside a single zip file
I try to create 20 client on website that just provide me 10 client config file let me dlownload