Did you download the latest update from posersoftware.com? The older version from Smith Micro won't accept any serial number because its servers have been shut down, as Poser now belongs to Bondware.

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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.