Right-click Data1.cab and extract it using 7-Zip (or WinRAR). This will create a folder full of raw application files.
The original installer checks for Windows 98/2000/XP. To bypass:
Some users keep it for vintage video effects (the "Old Film" filter is a cult classic), running on legacy capture hardware (like old DV FireWire decks), or maintaining a consistent workflow from the early 2000s.