Which version of Silver Efex Pro is current

Nik Collection
1

MacUpdate just provided me Silver Efex Pro 2 V2.2.24 at 65.6 MB
But the other version I have as part of the set is also Silver Efex Pro 2 V5.0.2 at 61.6 MB
I am confused!

2

I have the V5.0.2.137 x64 (V2.0.4).

3

Finder shows 5.0.2. Digging into the app, I see 5.0.2.137