Can't load a python plugin via the Plugin Manager in Desinger 14.0

You all rock! Cheers!

Hello,
 
Thank you for reporting this issue. Indeed, we are aware of this bug ad are working on fixing it.
 
In the meantime, I have confirmed a reliable workaround for all the impacted operating systems: plugins can be loaded again by turning on their autoload attribute directly in Designer's registry settings - this is akin to checking the checkbox.
 
Here is are the steps to follow for each operating system:
 
Windows
 

1. Press 'Windows + R'
2. Type regedit and press 'Enter'
3. In the Registry Editor, paste this path* to the address bar: HKEY_CURRENT_USER\Software\Allegorithmic\Substance Designer\session\lastSession\plugins
4. In the tree view on the left, select a numbered folder under plugins
5. In the list view on the right, you can check the plugin's name and location
6. Double-click the autoload item and set its value to true
7. Start Designer

*: If Designer is installed using Creative Cloud Desktop, the path is HKEY_CURRENT_USER\Software\Adobe\Adobe Substance 3D Designer\session\lastSession\plugins
 
macOS
 

1. Make sure the Xcode app is installed, has been started at least once , and the startup prompts have been completed
2. Open a Finder windows
3. Press Cmd+Shift+G
4. Paste this path and press Enter: ~/Library/Preferences
5. In the list, locate the com.allegorithmic.Substance Designer.plist file* and double-click it to open it in Xcode
6. In the plist file's settings, locate the entries related to plugins, they should be numbered and the entries for a same plugin share the same number
7. Check the plugin's name and location
8. Set the plugin's autoload entry to YES
9. In the main menu bar, go to File > Save
10. Start Designer

*: If Designer is installed using Creative Cloud Desktop, the file is com.adobe.Adobe Substance 3D Designer.plist. It may be under an Adobe folder.
 
Linux Ubuntu
 

1. Open the Terminal
2. Enter this command: nano "$HOME/.config/Allegorithmic/Substance Designer.conf"
3. In the nano text editor, locate the entries starting with lastSession\plugins
4. For each numbered plugin entry, check the plugin's name and location
5. Set the value for the plugin's autoload setting to true
6. Press Ctrl+O, Enter then Ctrl+X to save the changes and exit nano
7. Start Designer

 
Please let me know if that helped. Thank you for your patience!