I have removed the previous link, try this...

Description: Parallax Extreme Q4 v1.3 ! (bug fixed)
You can use the following link to retrieve your file:

http://www.sendspace.com/file/7sff2j

Also i want to remember that with the KeyPad keys + slash or star keys a better mode for NVidia owners can be toggled on & off !

Be the first to get it, now compatible with both ATI & NVidia gfx cards.

Description: Parallax Extreme Q4 v1.3 !
You can use the following link to retrieve your file:

http://www.sendspace.com/file/kzyjh4

8)

Hello, i am David F.M. (Dafama2k7), the author of the mod...

How to install Parallax Extreme v1.2 for Q4...:

Copy the mod's folder into Quake IV folder (NOT Q4Base) and select it from the mods menu in game.

Remember that v1.2 or lower needs Shaders v3.0 and up so most ATI gfx cards won't be able to use it.

NEW v1.3 comming soon addresses this, are faster and compatible with both ATI & NVidia gfx cards and Shaders v2.0 and up.

Make sure that the Autoexec.cfg file contains this...:

image_usePreCompressedTextures "0"
image_useCompression "0"

To make sure you are using Parallax features open the console and do this...:

image_usePreCompressedTextures "0"
image_useCompression "0"

set fs_game parallax_extreme_q4

reloadEngine

Wait a little and will run now, enjoy ! :)

Also a NEW much better v1.3 Parallax Extreme will come shortly, this time compatible with both ATI & NVidia gfx cards !!!

I am uploading it now...