Since Visionary Render 2.0 we provide a Programming Guide with in-depth documentation about the Lua and C APIs available in Visionary Render.
A key part of this document is the API changelog, which details any API changes between versions, starting with changes in Visionary Render 2.0.0.
If you use event scripts in Visionary Render or are responsible for maintaining them, it is highly recommended that you review this changelog.
You can find the programming guide in the start menu after installing Visionary Render.
Additionally the Programming Guide can be viewed online here.