Can anyone help me install source pause tool on non steam HL2?
you put the spt.dll in the hl2 folder, then in the console, type “plugin_load spt”
done 
notice that if you are not using a spt built for your version, some feature might not work !
You can also create an “autoexec.cfg” file in your cfg folder and put “plugin_load spt” in it so you don’t have to type it everytime you launch the game.
Also make sure you’re on Windows since there isn’t an SPT version for other operating systems.