Like icprncss2 mentioned, some DAZ content looks for Poser.exe in the runtime you are installing some of the gen4 content to. I've been able to use an "empty" text file with the name Poser.exe and everything works fine for me. I don't think you actually need a real poser executable (saves a little bit on disk space using the empty text file). Just open notepad, save the default file to your external runtime, then rename it to Poser.exe and everything should work.

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