Need help with theme forest Vega Version 1.3.6

First I have to apologize for my bad english. I hope you understand me anyway. I have a regular license for the theme Vega. The version is 1.3.6. Because of PHP 7.2 I have to make an update now. An update to the new version but shatters my site and I would have to make the site completely new. Is there another possibility?
I have to say that I have not personally installed the site and the former agency does not exist anymore. Unfortunately, I do not have much idea. Can someone help me anyway?


You are using old version and now want to update the theme. I would like to contact theme author and let them know and ask them is there any risk or how you can update the theme so that your site keep safe.
Please check How to Contact your purchased theme Author