Dear aspirant,

As you have mentioned that you have lost your 10th passing certificate and you have downloaded the scanned copy from the official website. Till the application process where you have to upload the documents it will work.

But during verification of documents in physical may be they would ask for the original. But dont as you have scanned copy, it will work now. And for backup just laminate that scanned copy of your passing certificate. That would do your work.

I hope this answer helped you out!!