At least on Windows, V4 works just fine outside of the main runtime in the last several versions of Poser (since P6, IIRC). I have never used V4 in my main Poser application runtime.

If you don't want to create a dummy Poser.exe file, though, you'll need to choose DAZ Studio as the intended program when installing (don't worry, that's the only difference if you do, and no, you don't need DS installed).

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3