Upgrading from 1.12 to 4.1.5

Hello all,

We have a private network hosted for our employees using elgg frame work. The person who was maintaining the website, expired due to COVID19 three months before. We are new to this and we want to upgrade from 1.12 to latest version of elgg.

Can you all help us to upgrade our network?

please provide us, each and every details to upgrade. We observed that 1.12 has a different directory structure compared to 4.1

May God give you good health and prosperity

Thank you