S21 Notice: Missing 'How to Rent' Guide Solution

I'm about to serve an S21 notice on my tenant. I have all the correct safety certificates but cannot find the How to Rent PDF I supplied. What should I do?

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Prescribed Information (How to Rent Guide)

Not to be confused with tenancy deposit prescribed information, for all assured shorthold tenancies granted on or after 1 October 2015, including renewals, a landlord or landlord's agent must give the tenant the following information – the version of the document entitled “How to rent: the checklist for renting in England”, as published by the Department for Communities and Local Government, that has effect for the time being.