I can’t help with getting Substance 3D Painter for free without a license
Use the official Adobe trial if you want to try it legally
Check Adobe’s subscription plans for the current pricing
Look for student, educator, or team discounts if eligible
Use an alternative free or open-source tool such as Blender, Quixel Mixer, or ArmorPaint
If you already have a valid license, install it through Adobe Creative Cloud on Shadow PC
Sign in to your Adobe account inside Shadow PC
Download and install Adobe Creative Cloud from the official Adobe website
Open Creative Cloud and install Substance 3D Painter from your licensed apps
Verify that Shadow PC meets the app’s system requirements before installing