It has been a long time since I created MySQLWorkbench plugins, in that time version 6.x was available.
At the time I'm writing this post, version 8.x is avaiable and I want to thank to following users their feedback, they reported taht previos plugins was not working with 8.x version:
I updated https://github.com/tmsanchez/workbenchscripts/blob/master/HTMLSchemaReportWB8.py script and now are compatible with 8.x version and are available on my github report:
https://github.com/tmsanchez/workbenchscripts
Also I created a new plugin to generate schema in Markdown format https://github.com/tmsanchez/workbenchscripts/blob/master/MarkdownSchemaReportWB.py
Please try this scripts and let me know any issues you have.
Important Note: Some users reported that they can't open MySQLWorkbench 8 after install older pyton plugin. To solve this:
1. Open windows Explorer
2. Go to %APPDATA%\Roaming\MySQL\Workbench\modules
3. Delete older HTML pyton plugin
4. Start your MySQL Workbench.
Thanks to Nestor Rodriguez and Alfredo Duran for their comments regarding MySQLWorkbench 8