[FAQ] Fixing the "Not an Autodesk path" Installation Error

Note: You must copy the os_fast_ref_package folder itself — not just the files inside it.

Step 4. Register Macros and Menus

In the 3ds Max MAXScript Listener (F11), select all → copy → paste the script below, then press Enter to run it.

This script automatically detects your 3ds Max version:

• 2025 and later: Auto-registers the OS Tools menu
• 2022 ~ 2024: Guides you to register via Customize UI

(
    local scriptsDir = getDir #userScripts
    local macrosDir = getDir #userMacros
    local startupDir = getDir #userStartupScripts
    local toolDir = scriptsDir + "\\os_fast_ref_package\\"

    local maxVer = (maxVersion())[1]
    local is2025orLater = maxVer >= 27000

    if not (doesDirectoryExist toolDir) then (
        messageBox "os_fast_ref_package folder not found in scripts path.\nPlease complete Step 3 first." title:"Error"
    ) else (
        local macroFile = macrosDir + "\\os_fast_ref.mcr"
        local toolDirSlash = substituteString toolDir "\\" "/"
        local pyCode = "import sys; tool_dir = r'" + toolDirSlash + "'; sys.path.insert(0, tool_dir) if tool_dir not in sys.path else None; from os_fast_ref.main import openWindow; openWindow()"

        local f = createFile macroFile
        format "macroScript Osfastref\n" to:f
        format "    category:\"OtakuSolutions_Tools\"\n" to:f
        format "    toolTip:\"os_fast_ref\"\n" to:f
        format "    buttonText:\"os_fast_ref\"\n" to:f
        format "(\n" to:f
        format "    python.Execute \"%\"\n" pyCode to:f
        format ")\n" to:f
        close f
        macros.load macroFile

        if is2025orLater then (
            local menuSrc = toolDir + "_register_menu.ms"
            local menuDst = startupDir + "\\os_fast_ref_menu.ms"
            if doesFileExist menuSrc then (
                copyFile menuSrc menuDst
            )
            messageBox "Installation complete! Please restart 3ds Max.\n\nAfter restart:\n  Main Menu > OS Tools > os_fast_ref" title:"os_fast_ref Installation Complete"
        ) else (
            messageBox "Installation complete! Please restart 3ds Max.\n\nTo launch:\n  Customize > Customize User Interface\n  Category: OtakuSolutions_Tools\n  Drag the os_fast_ref button to your toolbar." title:"os_fast_ref Installation Complete"
        )
    )
)

When completed successfully, a confirmation message will appear.

Step 5. Restart 3ds Max

Fully quit and relaunch 3ds Max.

Step 6. Verify Launch

FAQ

Q. Step 4 says "os_fast_ref_package folder not found in scripts path."

→ Please check that the os_fast_ref_package folder was copied to the correct location in Step 3. The folder must be placed directly under the path printed by getDir #userScripts.

Q. After restarting, I can't see the OS Tools menu. (2025)

→ Go to Customize → Customize User Interface → Category: OtakuSolutions_Tools and drag the os_fast_ref button directly onto your toolbar.

If you have any issues or questions during installation, feel free to contact us anytime.

• OtakuSolutions Customer Support