With one license you are indeed entitled to install Photoshop on two computers.
Is this the site that fails for you?
This might be an alternative if you follow the instructions.
Hello Bee Jay,
if you referring the following page http://helpx.adobe.com/x-productkb/policy-pricing/cs6-product-downloads.html
The 2 files referring here are:
1. File 1 of 2: Product installer compressed file of 1.1GB in .7z format
2. File 2 of 2: .exe file (few MB) that acts as an extractor for the File 1 (1.1GB).
You need to download both these files to extract and install PS CS6 extended.
if you already have a winrar on your machine then you do not need the .exe file. Winrar will be able to extract .7z file.
if you still see any issues with .7z file or installation, let us kow.