How to easily convert .sb3 files to .sb2 format.
Converting Scratch 3.0 Project Files to Scratch 2.0 Project Files (.sb3 to .sb2 conversion) basically means downgrading your Scratch program's version from 3.0 to 2.0.
Use the SB3 to SB2 Converter on GitHub to accomplish the desired .sb3 to .sb2 conversion.