I've been installing Poser so often that I'm doing it almost automatically, so that  I can't remember the details but:
1. among the first questions, the install procedure asks you where to install Poser => not on the C: drive thanks - lol
2. then another question appear (later?) and I know that I select the second option ("install on another drive" or something like that) because the default option (the first) will drop the runtime on a public, shared folder, and that's a "No! thanks, once again" 'cause this folder structure lies in fact most of the time on the C: drive, under "C:\Users" if I'm not wrong, that's the moment when I ask the procedure to put the content runtime onto "P:\Poser\Runtimes", this part of the install procedure maintains the "Poser 13 Content" part of the full name

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, Sequoia 15.2, 16GB, 500GB SSD
👿 Nas 10TB
👿 Poser 13 and soon 14 ❤️