There is now a beta version uploaded that includes plugin parameters for restricted item options. You can restrict tiems via notetags or using the item type "Key Item"
Viewing post in Storage inventory system
Since you're using an existing project, make sure you either delete the plugin from the plugin manager and reinstall it, or open it and open the plugin parameters Restricted ITem Options and Restricted Item Term, as those will be empty if you simply replaced the old file and did not re-open the parameters.
If you are still having issues, check the console for errors, and press F12 to view the console.
The Discord link and other contact methods are on the main profile page.
Discord Server Link: https://discord.gg/3hxjESk