How things have changed!

[Superdeer]

So its simple really, I have been away from Hammer Editor and Half-Life 2 modding for a while and how things have changed.

Where is Source SDK?,

Which SDK Base do I need?

I want to continue my Left 4 Dead 2 campaign but am completely lost with all the new versions.

Could someone please tell me what I need to install to get back to mapping again!

[LordDz]

If you want to continue your L4d2 campaign, you install the L4d2 Authoring tools like always?
Which can be found here:
steam://install/563
"https://developer.valvesoftware.com/wiki/Authoring_Tools/SDK_%28Left_4_Dead_2%29"

[LordDz]

If you want to continue your L4d2 campaign, you install the L4d2 Authoring tools like always?
Which can be found here:
Steam link
Wiki link

[Superdeer]

Thanks for some reason I had only L4D2 Beta Authoring tools not the original. Thanks though!!