Hello aspirant,

OMR answer sheet is available on the site, you must be mistaken with the download. Here are the steps to download OMR you may try with that: 

• Click on the link provided on the page above.
• Enter the login details such as application number and password and click on ‘login’
• Then, click on ‘OMR challenge’ provided on the left-hand side of the screen
• Click on the button ‘Click here to view your OMR answer sheet’ to check the image of NEET 2019 OMR sheet.

You may go through the link for more details: 

https://www.google.com/url?sa=t&source=web&rct=j&url=https://medicine.careers360.com/articles/neet-omr-sheet/amp&ved=2ahUKEwjztZ7xoNviAhWMM48KHVdvCG8QFjACegQIARAB&usg=AOvVaw32iIufdc_M2rVoGTe6jr-C&ampcf=1

Best of luck!!