How can I open TF2 maps in Hammer to modify them?

Train53

L1: Registered
Aug 22, 2020
1
0
First I want to clarify that this is translated by google so forgive any misspelling :3

The question is the following, I want to modify some TF2 maps with a winter theme, similar to what happens on Halloween (Scream Fortress) como Hightower = Helltower.
But I don't know how to open the maps or where to find them and I just want to MODIFY THEM, not make others because I don't want to completely alter the map and make it unrecognizable
Can somebody help me?

Oh and this is my first post in this page
 

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Pinsplash

bad bad bad
May 8, 2016
156
71
you can find decompiled valve maps at https://tf2maps.net/threads/valve-maps-decompiled.5952/

however i think decompiled maps arent perfect and have like, broken areaportals or something

They were broken on older versions of BSPSource, but the newest version (1.40.0) more or less fixes that. (I've done some comparison screenshots with a CSGO map and saw situations where areaportals wouldn't cull things they clearly should cull, but it could be CSGO being CSGO.) Xi.Cynx says they updated the maps two days after the 1.40.0 release, so I would assume they're up to date.