Since legacy Photoshop software is difficult to source safely today, many creators use these free, modern alternatives that mimic the CS1 workflow:
If you are looking at the legacy capabilities of this version, its major "features" at the time included: Layer Comps: adobe photoshop cs1 free
By now, you might be realizing that hunting for a two-decade-old piece of software is like trying to use a flip phone on a 5G network. You can do it, but it will be frustrating and limited. Since legacy Photoshop software is difficult to source