That ProgramData path is the folder the Vault client scans for auto-loading extensions, and writing there is what triggers the admin prompt. A couple of things:
1. I'm not aware of a supported per-user (%userprofile%/AppData) auto-load location for the Vault client the way AutoCAD has roaming support paths. The hints you're finding may be carrying over from AutoCAD, which does support that. Happy to be corrected if someone has it working, but I wouldn't build a deployment on it.
2. The realistic no-admin route is permissions, not a different folder. Have IT grant your account write on a subfolder under ...\Vault 2026\Extensions once, or pre-create your extension's folder there with write rights. Creating the folder needs elevation; copying files into a folder you already have write on does not. After that your installer is just a file copy and runs unelevated.
3. For many machines, push that once as a GPO or ACL, then per-user installs never need admin again.
Are you deploying to a fleet or just your own workstation? That decides whether it's a one-time IT ACL or worth scripting.
Jose Luis Baquero Rivera
Mechanical Engineer
Open to projects, feel free to contact me
josebaqueror.com
https://www.linkedin.com/in/joseluisbaquerorivera/