Where to download Adobe Gamma

If you are using OSX there is a software calibrator under System Prefs>Displays>Color which lets you empirically set gamma and color temp, and then generate a monitor profile based on those observations. It wouldn't be as accurate as a hardware calibrator, but it does generate a monitor profile, which the old Adobe Gamma did not do.

That must be a very old article. AFAIK Adobe Gamma went out with CS2 and that was the last we heard about it. What you use today is a calibrator such as a Spyder, i1 Display, ColorMunki etc.

Adobe Gamma was an early and primitive attempt at setting parameters for Photoshop's display color management, before calibration software and colorimeters became widespread.

Basically it was discontinued because it could not work with lcd monitors.

Here's a thread on this: Re: Adobe CS4 Gamma vs. Windows XP Gamma Solutions Needed