OK, let me first say this is not your standard question regarding software licensing. If I read it correctly the trial version of SQL 2008 R2 has a 6 month (180 Days) operational window and must be upgraded to continue using it.
Here is some background info, which gives the details of what I am doing ... https://www.experts-exchange.com/Microsoft/Development/MS-SQL-Server/SQL_Server_2008/Q_27269688.html
The Trial Version is installed on an external drive (Lacie USB) connected to my workstation and it all works as advertised and performance is acceptable; I am the only user and there are no Internal or External connections being made, local network, web or any other.
What is the cheapest licensing avenue to keep my SQL 2008 R2 installation running?