In a few rare cases, we've seen this error, just after installing and upon first launch:

This means usually that something failed during installation and it didn't register all components (ocx and dll mostly).
This can usually easily be fixed by running it once as Administrator. Running it as administrator re-registers the components to it.
Here's how:
Go to the folder containing your
installation of PD Howler or PD Artist. If it was installed on the
default C Drive, you'll probably find it here:
C:\Program Files(x86)\Steam\steamapps\common
In the example below, we had it installed on a different drive, the E: drive:

Scroll down to find the file named dogwaffle.exe:

Right-click the file, and select Run as Administrator:

That's it. This should fix the issue. The components will be re-gistered to this installation. From here on you should not need to run it as Administrator anymore.
However, if you run several different versions, such as PD Howler 11 and PD Particles, it might cause a problem
with one or the other installation. To prevent this, you might want to
set the property to always run it as Administrator. However, be aware
that this represents a security risk, so only do this if you're sure you
won't accidentally replace or delete important files.
If you're fine with it, right-click the file and select Properties:

and use the Compatibility tab :

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