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Please, edit your first post, you'll find a switch under main text field.
Click on it and provide your site backend credentials.
I guess that something went wrong at install and that way you got that error. But, if I fix that missing column I am afraid that a new other column is missing and so on... so my advice is to send me website database access and I will do a full fresh install (if this was a fresh install of guru).
In this way I can be sure that all tables are good and you can properly use the component.
I have exactly the same problem (1054 Unknown column 'guru_turnoffbootstrap' in 'field list').
I have to work with it so I am waiting for an answer.
I thank you in advance.
Thank you for your collaboration on this one!
Here is a patch attached, should be added, replace the existing one here: