A stale server list usually just needs a fresh download.
Right-click the SlickVPN icon in the taskbar tray and choose Exit — closing the window alone leaves it running.
Open the client again. On startup it downloads the current location list from our servers.
Check your internet connection and any firewall — the client needs outbound access to fetch the updated list.
SLICKVPN
Weston Road PMB #231
Weston, Florida 33331, USA