The "Old Version" of Format Factory is a testament to a time when software was smaller and more focused. For the 32-bit Windows 7 ecosystem, the older iterations (v3.x) remain the gold standard for stability and performance. However, they are slowly becoming obsolete as the world moves to newer video codecs.
The most critical thing to know is that Format Factory underwent a major architectural change. format factory 32 bit windows 7 old version new