I uninstalled Architect 4 about a month ago because of the popup ads in German. I understand that this is a free product, and that you need to make money, but I refuse to have software installed on my system that provides popup ads when it isn't running. There are other free options available. Also, to answer your question before, I have no German language settings on my computer.
I just logged into my system today and saw a new ad in English. Apps & Features in Windows 10 shows that I do not have the application installed. Task Manager shows that this is from your company's Manager Service and Messenger still running on my system after removing the application they are related to. These are not in Apps & Features, so this means that I have unregistered software from you providing ads and hiding from legitimate attempts to uninstall it. This makes your software incompetent at the best and adware/grayware at the worst.
I manually removed the leftover PDF Architect 4 Files that were leftover from the uninstaller in C:\Program Files (x86). I also found that there were files in C:\ProgramData\pdfforge\PDF Architect 4 Manager\ updated as recently as today, so this software is still attempting to maintain itself.
Interestingly, it looks like PDF Architecht 4 does not remove itself when you uninstall. There are also 4 leftover services running a month after the software was removed:
PDF Architect 4
PDF Architect 4 CrashHandler
PDF Architect 4 Creator
PDF Architect 4 Manager.
I stopped and disabled all of these services, and they told me where they were located. I removed the following folders that contained application data for PDF Architect 4:
C:\Program Files\PDF Architect 4
C:\ProgramData\PDF Architecht 4
C:\Program Files (x86)\PDF Architecht 4 (repeated here for clarification)
I've left the registry entries alone as they shouldn't bother anyone without being called, but all of this should have been deregistered and removed when the software was uninstalled. I would have even appreciated a message saying that the software cannot be fully removed until I reboot.
If you don't hear from me again, you can call this resolved. I will post back if I find anything else.