If you're looking to Download DigiLocker on your Chromebook laptop Then read the following guideline.

DigiLocker – A simple and secure document wallet for Citizens. DigiLocker is a key initiative under Digital India, the Government of India's flagship program aimed at transforming India into a digitally empowered society and knowledge economy. Targeted at the idea of paperless governance, DigiLocker is a platform for issuance and verification of documents & certificates in a digital way, thus eliminating the use of physical documents. The DigiLocker website can be accessed at https://digitallocker.gov.in/. You can now access your documents and certificates from your DigiLocker on your mobile devices.