Here are some links that will help you to download Ramayan in Hindi PDF format. You should note that Ramayan is written in Sanskrit by Adi kavi Valmiki; while Saint Tulsidas wrote it in Avadhi language. I will try to provide the downloadable links for both of them and other versions of Ramayan too.
Valmiki Ramayan in Hindi
Tulsidas Ramayan Download
Ramayan in English
I hope these links serve their purpose and will help you gain inner wisdom through the reading of Ramayan.