Any links to download PS CS5?

Since the old ps is on my mom's laptop and I'll probably will never use it because she's using it for her work now. I'll download one here in our old computer. But please, since our computer is old and I'm not really sure anymore if it's too dark or too light, tell me If ever it's too much of this and that on the lighting. I won't mind, I perfectly understand 'cause it's our computer's fault anyway .__.

Anyway, please tell me If any of you knows one :)

Thanks and I'll probably re-open this once I download one and when I checked what the status of everyone on their schedules.