The addon is not totally removed by just deleting the folder in the AddOns folder.
Before you proceed, ensure that World of Warcraft is not running.
Open up the Dugi Installer and click Settings button and then click on Repair button, then click on Okay x3 times, finally click Okay to exit the Options. Exit the Dugi Installer and then load up World of Warcraft and check to see if you get any .lua errors. If you do, then it’s not Dugi Guides.
The Repair button will remove all folders in Addons and WTF [Savedvariables] (user and account).
Open up the Dugi Installer and click on the Settings button and check your Username and Password, click on the Okay button and then click on Reinstall button to install the guides. If you are getting .lua errors you will need to now disable ALL addons except Dugi Guides, then you can then enable one addon at a time until you can find the culprit. Note the name and then use the CurseForge website and find the addon that’s causing issues and then use their report a bug or ticket to report to them the issue you are having.