Update opencart ecommerce website

I have migrated a number of opencart websites from my existing server to new server but needs to perform a few updates to ensure it works on the new environment. I need opencart expert to update my existing opencart Version 2.1.0.2 to the latest version for it to work on my new hostigator server.

If you are able to perform excellent work, there are about 5 other opencart websites I will hire you to upgrade them as well.