How to use "function" without getting an error regarding "deprecated feature"?

I have found a few older Construct source files from which I would like to learn a little about how Construct games are built.

That also works quite well. However, with some of the games I get the message that certain parts are no longer up to date. Or that they are no longer supported by the current Construct version.

This also includes the message “Plugin Function (function) by Scirra is deprecated”

What does this mean? And how can I use functions so that no error occurs?

Many thanks in advance for your help

Functions have been migrated from a plugin to being built in to event sheets. They have the same or more functionality than the old plugin functions, but old example projects may not have been updated.

To use the new construct 3 built in functions, refer to the manual. construct.net/en/make-games/manuals/construct-3/project-primitives/events/functions

There's more details in the manual entry on deprecated features.