It should be there but I recommend installing the newest version which is 2014. You probably used the outdated tutorial here is the newest one I wrote.
You can also just choose upgrade to upgrade 2012 to 2014
SQL EXpress 2016 will be out soon as well probably this year.
I recommend checking the services specifically SQL Server Browser if thats not running it will not work at all regardless if TCP/IP is enabled or not. Typically its enabled by default…
You should disable firewall on both server and client until you can get it connecting… once you get it connecting you can configure forwards to allow the firewall to skip the specific ports.