A compilation of this type (circa 2000s–2010s) would likely include (A3/A4 format) and instruction booklets in PDF or JPG format. Common models found in such packs:
The query appears to refer to a specific digital archive known as the GPM Paper Model Compilation
Printing parts on standard copy paper would cause the model to collapse under its own weight. Builders had to source specific cardstock, typically between 160gsm and 220gsm.