It won't delete your entire Poser folder - pretty sure it will keep your python scripts in place. (I say "pretty sure" because somewhere along testing I manually deleted my Poser folder to make sure I was testing the correct stuff, so I lost my scripts because of that.) In worst case, you can copy your entire Python folder somewhere else before installing, run the installer and then paste the Python folder over, telling it to not replace files that are already there (so that you keep possible new versions of base Python scripts)

And your preferences will be kept if, during installation, you ask the installer to use the existing preferences.There are the usual options to delete, backup (default option) or use existing preferences - just make sure not to skip through this option during installation.

This is the same as some other updates we've had for Poser before - the installer itself will uninstall, then install the new version.

I don't have an answer to your second worry - I've never had that problem.

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.