What's the average size of the downloaded items on the client machine?

Appeon ActiveX’s size is around 5.9 MB on 32bit machine and 9.26MB on 64bit machine.  

Other files (like html, JS file, dll/ocx, picture files, ini, etc.) will be downloaded to the client side, but the number and size of the these files really depend on the each application.  

If you want to know the size of your application once downloaded on the client machine, you can deploy it locally and run the application.

You will find the download files by default under C:\Users\<USERNAME>\AppData\Roaming\appeon\<APPLICATION_NAME>

The ini file will be stored by default with the IE cookies.