Restart your computer and check for update. If it doesn't help then
Two options:
1. open settings --> update & security --> troubleshoot --> windows update
this should fix your problem but It'll start redownloading windows 10 update
@Anish Pai Bro,
Set to meter connection.
Use MCT to download iso file (size: less than 4GB)
When the download completes Right click iso file and select mount --> double click setup. It'll start the upgrade process.
After upgrade check for windows update (you'll find few updates) update it (size: 300-500MB approx.).