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Materials And Sounds

Save the contents of the sounds folders to:
    Windows: C:\Program Files\Steam\steamapps\common\portal\portal\sound
    MacOS: ~/Library/Application Support/Steam/steamapps/common/portal/portal/sound

Save the contents of the materials folder to:
    Windows: C:\Program Files\Steam\steamapps\common\portal\portal\materials
    MacOS: ~/Library/Application Support/Steam/steamapps/common/portal/portal/materials

(On Windows 64-bit, replace Program Files with Program Files (x86).  On older versions of Steam, replace common with your Steam username.)

You may be asked about overwriting files if you have downloaded other map packs, like Portal: TFV.  It does not matter if you overwrite the conflicting files—they are the same.
SelectionFile type iconFile nameDescriptionSizeRevisionTimeUser
SelectionFile type iconFile nameDescriptionSizeRevisionTimeUser
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Materials for PortalZ and PortalZ: The 2020 Slice.  192k v. 16 Nov 4, 2020, 10:29 PM Zachary Yaro
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Sounds for PortalZ and PortalZ: The 2020 Slice.  10149k v. 10 Nov 4, 2020, 10:29 PM Zachary Yaro
SelectionFile type iconFile nameDescriptionSizeRevisionTimeUser
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These are the sounds for the first half of the PortalZ: The First Slice chambers. Download and follow the above instructions for BOTH sounds folders before downloading any maps.    10273k v. 8 Oct 7, 2020, 4:46 PM Zachary Yaro
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These are the sounds for the second half of the PortalZ: The First Slice chambers. Download and follow the above instructions for BOTH sounds folders before downloading any maps.    6385k v. 7 Oct 7, 2020, 4:46 PM Zachary Yaro