Can i input all data manually rather than download documents from financial institutions

Yes.  I prefer to manually enter mine.  When you first start entering a 1099.......

It's just as fast and easier to manually enter your W2 or 1099. Don't type the bank name or try to import it.
At the bottom pick - Change How I enter my Form

Then on the next screen pick - I'll Type it in Myself

Here's a screen shot I have