Convert from PUNbb 1.4.4

I have a forum running under punBB version 1.4.4 with extension PUN-attachments.

I would like to migrate to WPForo.
Is there a converter because I do not want to lose my 26000 posts.
Thank you.

I think you may have the wrong forum here. Keyboard Maestro doesn't have any direct support for WordPress. Have you done any searching for your need? I quickly found this:
Migrate to wpForo

Maybe it will help.