I'm adding more infos.
If your project is made in Construct 3 you will need a dedicated Construct 3 addon.
In theory, you indeed can have your Construct 2 project imported in Construct 3, nevertheless, to do so when using a third-part addon in the Construct2 project, you need to have a dedicated third-part addon for Construct 3 to open the project.
Some of the existing third-part addon authors are not active anymore indeed, but nothing possibly prevents actual active members to take on the addon and port it (that's what chadorireborn did for example with some of rexrainbow's addons).
If you only need to make sure the retention rate to the overall application, an analytic addon should indeed work as intended.
My warning was about if you wanted to analyze every "pages" (or layouts) in your application, as if they were different web pages, analytics perhaps won't allow to track those as easily as they would on an actual website.