PortableApps.com Installer 3.4.1 > 3.4.2 upgrade launcher not replaced

I've just noted the following error - after upgrading PAI from 3.4.1 to 3.4.2, the installer's launcher displays 3.4.1 rather than 3.4.2 for some reason. This is not the case when installing 3.4.2 directly.

Does anyone else see this behaviour?

See here for what I mean: http://imgur.com/a/S0WzB - The tooltip disappeared under my pointer, PAI displays in the menu as 3.4.2, which lines up with what appinfo.ini shows.

[EDIT] I thought maybe that the version number was hard-coded somewhere, although I felt it was unlikely, and as expected couldn't find the value of "3.4.1" when doing a NP++ "Find in Files" search in the PAI directory.

Maybe the launcher needs to be regenerated for 3.4.1 > 3.4.2?

[EDIT2]

After replacing the launcher exe temporarily with a "clean" 3.4.2 launcher, the incorrect value goes away, and comes back when the original launcher is put back in place. It appears the original launcher exe isn't deleted on upgrade. I'm reclassifying this as a bug report accordingly.