This post reviews ExpressVPN, a hosted Virtual Private Network (VPN) service. A hosted VPN service is a paid subscription service. With a VPN, all your Internet communication is encrypted and passed through a secure proxy (the VPN server) before continuing to the intended destination. To the rest of the world, the Internet traffic appears to come from the VPN server, not your home computer.
I know PostgreSQL is available as a binary from http://www.postgresql.org and to be honest I have always used it but just in case you need to go down the PostGIS route then you may need to recompile it.