Just as a reminder: in my case, my old Win10 installation kind of retired definitively a month ago. The motherboard simply refused to start.
I've built a new PC, Win11 this time, and I copy my old Poser stuff (Poser 11 installation folder + the runtimes + the last Poser 13 freshly installed) on a new SSD, the old one was not recognized by my new motherboard.

The result: Poser 11 starts without problem, no re-installation needed. You only need to copy the "Poser Pro\11" folder from your last PC at the corresponding place on a new PC, which means: backup.
I only had to edit and adapt the paths in the "LibraryPrefs.xml" file, using a simple text editor.

𝒫𝒽𝓎𝓁

---

(っ◔◡◔)っ

👿 Win11 on i9-13900K@5GHz, 64GB, RoG Strix B760F Gamng, Asus Tuf Gaming RTX 4070 OC Edition, 1 TB SSD, 6+4+8TB HD
👿 Mac Mini M2, Sonoma 14.6.1, 16GB, 500GB SSD
👿 Nas 10TB
👿 Poser 13 and soon 14 ❤️