eagerness "You should have told me that you don't know how to install it. " " Should have " is a hypothesis of the past, hence the subordinate verb should also be in the past for reasons of concordance. Simple past and past perfect both are usable here.
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eagerness"You should have told me that you don't know how to install it. I could have helped you.""Should have" is a hypothesis of the past, hence the subordinate verb should also be in the past for reasons of concordance. Simple past and past perfect both are usable here.