You are running an operating system that Photoshop no longer supports. Refer to the system requirements for a full list of supported platforms.
what should i do ?
what's your os?
if it meets specs, use compatibility mode to install.
What is the operating system that you have?
Please refer to Photoshop system requirements
Download creative cloud desktop application through the link mentioned below-
*It would help you downloading older version of PS which is compatible for your OS.