I cannot find an original template in my sheets folder

I downloaded the Meeting Management template set, and used the agenda and follow-up sheets; I made several edits but now need to revert to the original templates - I cannot find those templates - when I go back to the set only the reports are existing; I've gone to the template library and I can't seem to download anything there… I've managed to delete some functionality and need it back (as it is in the original template) - help! thank you

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