Downloading Portal 13.13.1115.1551 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The software lies within Games, more precisely Action.
We recommend checking the downloaded files with any free antivirus. This PC tool can operate with the following extension: ".vst". You can set up this PC software on Windows XP/XP Professional/Vista/7/8/10/11 32 and 64-bit.
The default filenames for the program's installer are portal2.exe, 1CAMP.exe, RUN_GAME.exe, PS3SavePortal.exe or Portl.exe etc. The most popular versions of the Portal are 13.1, 2.0 and 1.5. This program is an intellectual property of Falco Software Company.
From the developer:
Interesting game. You need to get through the portals of the dungeon. You - a small ball. Funkiness, but bold. Try out! Good luck!
You may want to check out more software, such as DAoC Portal, Amazing Portal Generator or Varian Portal Dosimetry, which might be related to Portal.
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