Why are there two versions of an app listed as being present?

[DSeawel]

I see this from time to time. There will be an old version of an application listed (red), and a new version too (green).
In this case, it is Audacity.
Here's a screenshot: https://www.screencast.com/t/w2KEfCe6
Why doesn't the old version get replaced when PMPC installs the new version?

[Admin - Omar]

This is how the old Audacity installers were designed, they weren't replace the new update with old one! They were just install alongside it! Resulting 2 or more updates to be installed in the same time! But they fixed that starting from v3.1 as I remember..
So you just need to manually remove the old one v3.0.2 from "Add/Remove Programs" and it will not  happen again