FAQ.1 — Permission denied / scripts write access on install

Overview

When .mzp install fails with Permission denied / Errno 13,
grant Windows write permission to the 3ds Max scripts folder.

If it still fails after fixing permissions → FAQ.2 — Manual install

Example error

Installation failed: [Errno 13] Permission denied:
'...\3dsMax\2025 - 64bit\ENU\scripts\startup\os_bipedPlus_menu.ms'

0. Confirm the exact scripts path in 3ds Max (required)

Do not guess paths like %LOCALAPPDATA%\....
Open the folder from the result of a script run in that Max version.

1. Launch the same Max version that failed
2. F11 → MAXScript Listener
3. Run:

format "userScripts = %\n" (getDir #userScripts)

Paste the script into the editor and run it. Listener should show userScripts = ...\ENU\scripts and OK.

1. Note the userScripts path exactly as printed. Example:

userScripts = C:\Users\username\AppData\Local\Autodesk\3dsMax\2025 - 64bit\ENU\scripts\

This is the scripts folder you will grant write access to.
Username and version numbers differ per PC — use only the Listener result.

1. Note the path, then quit all Max instances
2. In Task Manager, end any leftover 3dsmax.exe

1. Open scripts folder Properties

1. Paste the userScripts path from step 0 into Explorer’s address bar
      (a trailing \ is fine)
2. Press Enter to open that scripts folder
3. Right-click empty space or the folder → Properties

Grant permission on the scripts folder (do not stop at startup alone).

2. Check your account on the Security tab

1. Open the Security tab
2. Select your currently signed-in Windows user
3. Do not look only at Administrators — select your own account
4. Under Allow, confirm Full control / Modify / Write
5. If missing or incomplete, click Edit

3. Allow permissions and confirm

1. Select your account again
2. Check Allow → Full control
3. Minimum: Modify, Write
4. OK → Apply → OK

If your account is not in the list:
Add → enter username → Check Names → allow Full control

4. Remove startup files, then reinstall

1. Go into startup inside the userScripts folder above
2. If these files exist, delete them (files marked with a red X):
3. os_bipedPlus_menu.ms
4. os_bipedPlus_path.ms

1. Fully quit 3ds Max, then restart it.
2. After restart, drag-and-drop the matching .mzp to install.
      (No manual file copy needed — just reinstall with the .mzp.)

If it still fails

→ Continue with FAQ.2 — Manual install

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