I currently have a 4 page document that has a lot of active x control boxes with VBA controlling it. This document is housed in a third party application to allow us to record information that stays within a record in that application.
After a recent upgrade to the application I have been informed that it will no longer support documents using Active X or Legacy controls. I have recreated one of the shorter documents using content control and VBA. Are there any tools to convert the document I currently have? or what are the best alternatives to active X and the background controls?
I hope that makes sense
You've found the best alternative in Content Controls. Most Content Controls are compatible with Office back to the 2007 version. They also work in Word for Mac 2016 and 2019. I haven't heard of any utilities that can automatically convert ActiveX controls to Content Controls. The VBA is quite different between the 2 control types, so you'll definitely have some re-writing to do.
Here is Microsoft's page about using Content Controls with VBA: Working with Content Controls
In addition, there are resources like Greg Maxey's pages about Content Controls and VBA: Content Controls