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StackVPN runs on WireGuard. There is no StackVPN app to install: you use the official WireGuard client for your platform and load a config from your dashboard. Each location has its own config, and you can keep several of them side by side.
Open the Dashboard, pick a location and click Connect. After a few seconds the card shows Download Config and Show QR Code. Configs are only available from the dashboard after you log in; we never send VPN keys by email.
wg_uk.conf.Install the wireguard-tools package from your distribution, download the config, then:
sudo cp ~/Downloads/wg_uk.conf /etc/wireguard/
sudo chmod 600 /etc/wireguard/wg_uk.conf
sudo wg-quick up wg_uk # connect
sudo wg-quick down wg_uk # disconnect
Or import the file into NetworkManager: nmcli connection import type wireguard file wg_uk.conf.
Connect to as many locations as your plan allows and import each config as a separate tunnel. Only activate one tunnel at a time: WireGuard routes all traffic through the active one, and two active tunnels fight over the default route. To free a slot, click Disconnect on the dashboard, which revokes that config on the server.