: Run the installer and select the "Install this product as a trial" option.
That being said, if you're looking to understand how some cracks are applied (for educational purposes, and assuming you have a legitimate copy of Photoshop CS5 and are only looking to understand the process), here's a general overview: crack photoshop cs5 64bit amtlib.dll
Using cracked software carries risks, including exposure to malware and lack of official security updates. For a stable experience, many users recommend reinstalling original versions through official Adobe channels. Photoshop CS5 x64 doesn't run. - Adobe Community : Run the installer and select the "Install