Assuming you want the safest, most reliable , follow this guide:
Before CS2, there was Photoshop 7.0. Released in 2002, this version introduced the Healing Brush and the Patch Tool. It is tiny (under 150MB), runs on a USB stick, and boots in two seconds. free adobe photoshop old version
In 2013, Adobe shut down the servers that activated Photoshop CS2. To ensure that legitimate paying customers could still reinstall their software if their computer crashed, Adobe released a version of CS2 that did not require server activation, along with a universal serial key. They made this download publicly available on their website. Assuming you want the safest, most reliable ,