HI.
I'm running this on MW 1.21.2 with SMW 1.8.0.5. Validator 0.51 is installed, but this extension throws the error "SideBarMenu requires extension ParamProcessor".
ParamProcessor has been superceded by Validator.
If I knock out the check for the ParamProcessor version. It then throws
Fatal error: Class 'ParamProcessor\Processor' not found in /var/www/webapps/localoffer_dev/extensions/SideBarMenu/src/Hooks.php on line 155
So as it stands, this extension is broken if you have SMW 1.8+ installed.
Also worth noting, Validator is shortly becoming version 1.0. I've tried this extension with v1.0 and no sidebar shows at all.