If you are using an older version of SketchUp (specifically versions prior to SU2017), you cannot use the current updates. Instead, you must use a dedicated legacy/archived version
to keep your plugins like Curviloft or RoundCorner functional. SketchUp Community Essential Legacy Version Details For users on SketchUp 8 through SU2016 , the most stable and recommended legacy version is LibFredo6 v9.5k SketchUcation Compatibility : This version is strictly for SU2016 and older
. It will not work properly on modern versions (SU2017+), which require or higher. Key Limitation "Check for Update"
feature is disabled in legacy versions to prevent them from accidentally trying to install incompatible modern versions. Where to Download : You can find this archived version on the SketchUcation PluginStore under the name "Prior2017 - LibFredo6" SketchUp Community How to Install an Old Version (.rbz)
Since older SketchUp versions have different menu layouts, follow these steps based on your software version: SketchUp 2013 to 2016 Window > Preferences > Extensions Install Extension button at the bottom. Select your downloaded LibFredo6_9.5k.rbz SketchUp 8
If you don't see an "Install Extension" button in Preferences, you may need to update to the latest maintenance release of SU8.
Alternatively, you can manually extract the contents into your Plugins folder (usually located in
C:\Users\YourName\AppData\Roaming\SketchUp\SketchUp 8\SketchUp\Plugins Final Step Restart SketchUp immediately after installation to initialize the library. SketchUcation Troubleshooting Common Issues
Keeping Your SketchUp Smooth: The Guide to LibFredo6 Updates
If you use SketchUp, you’ve likely encountered LibFredo6. It isn't a standalone tool; rather, it’s a vital shared library that powers some of the most popular extensions like RoundCorner, Curviloft, and JointPushPull.
When users search for "libfredo6 old version upd," they are usually hitting a wall where their favorite plugins stop working because the underlying library is out of sync with their SketchUp version. Here is everything you need to know about managing LibFredo6 versions. Why You Need to Update
LibFredo6 handles the "heavy lifting" for other plugins—things like language translation, default parameters, and update checking. If LibFredo6 is outdated, your other Fredo6 plugins may: Fail to load entirely. Display error messages about missing dependencies. libfredo6 old version upd
Lack compatibility with newer SketchUp releases (like SU2024 or SU2026). Dealing with "Legacy" Versions
If you are running an older version of SketchUp, you cannot always use the latest LibFredo6.
SketchUp 2017 to 2026+: You should use the latest versions (v10.0 and above). The current release as of early 2026 is v15.9a.
SketchUp 2016 and Older: These require "Legacy" versions. The final archived version for pre-2017 SketchUp is v9.5k. Note that "Check for Updates" is often disabled in these older legacy versions. How to Update Properly
There are two main ways to ensure you have the correct version installed: Update for Fredo6 Plugins - Extensions - SketchUp Community
is a shared plugin library required to run most extensions developed by
(such as RoundCorner, JointPushPull, and Curviloft). If you are using an older version of SketchUp (pre-2017) or encountering compatibility errors, you may need a specific legacy version or a technical update to your library. Core Functions
LibFredo6 is not a standalone tool; rather, it provides a unified framework for: Language Translation : Localizing Fredo6 tools into multiple languages. Menu Management
: Standardizing how toolbars and settings appear in SketchUp. Check for Updates
: A built-in feature to notify users when a new version of the library or a dependent plugin is available. Technical Compliance
: Managing file and folder naming conventions to remain compatible with the SketchUp Extension Warehouse. Legacy Versions for Older SketchUp If you are using an older version of
Newer versions of LibFredo6 (v10.0 and above) generally require SketchUp 2017
or newer. If you are running an older version of SketchUp, you must use a legacy release: SketchUcation LibFredo6 v9.5k : This is the primary archived version for users on SketchUp 8, 2013, 2014, 2015, and 2016 Availability : These legacy versions are hosted on the SketchUcation PluginStore specifically for users with "old" software setups. SketchUcation Unable to update or remove extensions (Fredo). SU Pro 2020
To update an old version of , a shared library required for popular SketchUp plugins like RoundCorner JointPushPull , follow these steps. Recommended Update Method (Automatic)
The easiest way to keep LibFredo6 and all related plugins up to date is through the Sketchucation ExtensionStore tool Open ExtensionStore : In SketchUp, open the Sketchucation toolset. Check for Updates
: Click the gear icon at the top left to see a list of extensions needing updates. Update All
: Click "Update All" or the individual "Update" button next to LibFredo6. Restart SketchUp quit and restart SketchUp for the update to load properly. Manual Update Method (RBZ File)
If you prefer manual installation or are using an older SketchUp version: Download the RBZ : Get the latest version from the LibFredo6 page on Sketchucation . A free account is required. Install via Extension Manager In SketchUp, go to Window > Extension Manager Install Extension and select the downloaded Restart SketchUp : This step is critical to avoid loading errors. Legacy Support (For Older SketchUp Versions) If you are using a version of SketchUp older than 2017 , you must use "frozen" legacy versions of the library. SketchUp 2016 and older Archived LibFredo6 v9.5k SketchUp 2017 to Present : Modern versions of LibFredo6 (v10.0+) are compatible. Troubleshooting Tips LibFredo6 Installation in Sketchup 2025 - Extensions 9 Aug 2025 —
Understanding LibFredo6: Updates and Legacy Versions for SketchUp
If you use SketchUp, you’ve likely encountered popular extensions like Curviloft, RoundCorner, or FredoScale. These powerful tools rely on a foundational shared library called LibFredo6. While the latest versions are designed for modern SketchUp releases, many users still search for "libfredo6 old version upd" because they are running older software or encountering compatibility issues. What is LibFredo6?
Developed by Fredo6, this library is not a standalone plugin. Instead, it provides common functions—such as user interface elements, language translations, and update checkers—that allow Fredo6's other extensions to function.
Host Site: Most official files are hosted on the SketchUcation PluginStore, which requires a free account for downloads. Key Functions of LibFredo6:
Core Function: It manages default parameters, trace logging, and ensures your other Fredo6 plugins can communicate with the SketchUp API. Legacy Versions for Older SketchUp Builds
The primary reason to seek an "old version" is software compatibility. As of version 10.0, LibFredo6 is maintained only for SketchUp 2017 and above.
For users on older systems, Fredo6 provides Legacy (Prior_2017) versions:
Compatibility: These are designed specifically for SketchUp versions prior to 2017 (e.g., SU8, SU2013–2016).
Archived Version: The latest archived legacy version is typically v9.5k.
Key Difference: Legacy versions have the "Check Plugins for Update" functionality disabled to prevent compatibility errors with modern library changes.
Where to find: These can be found on the SketchUcation Legacy Archive. How to Update LibFredo6 (Manually or Automatically)
Keeping LibFredo6 updated is critical because most Fredo6 plugins will stop working if the library version is too far behind the plugin version. Update for Fredo6 Plugins - Extensions - SketchUp Community
Fredo6 personally supports his tools on the official SketchUp Community forums. Search for posts from Fredo6 himself. Look for threads titled "LibFredo6 - Last version for SketchUp 2017" or similar. He often attaches older RBZ files to specific replies.
site:forums.sketchup.com "LibFredo6" "SketchUp 2017"C:\Users\[YourName]\AppData\Roaming\SketchUp\SketchUp 2017\SketchUp\Plugins on Windows, or ~/Library/Application Support/SketchUp 2017/SketchUp/Plugins on Mac).The keyword includes the curious term "upd." In programming, this is shorthand for "Update." However, in the Fredo6 ecosystem, it appears in file names and menu options.
When you see an "Upd" request, the system is looking for a delta patch—a small piece of code that changes your current version to a newer one without a full reinstall.