Hello,
Welcome to the HP Forums! I understand you are unable to install the Scanjet 200 Flatbed Scanner. Are you receiving any error messages on your computer, indicating why you are unable to install this software?
What is your operating system on your computer? Windows.
You want to make sure you do not connect the USB cable into your computer until it prompts you to connect. I will provide a HP document on Setting up the Scanner and Installing the Software.
Looking forward to hearing from you.