It's conceivable that your old PC lacks resources for optimal handling of lengthy or complex video projects - a fast processor and capable video adapter. And for those projects it's best to use the 64-bit version of Videopad.
The site with the files does list version #s and dates. For example...

That's 16.15, released on 5/7/24. Because there's no mention of 64-bit, this would be a 32-bit version. The 64 would look like this...

The current version, 16.22+, is here.