A new window that links up with our servers to check for updates should pop up. It will initially double-check to ensure your software is up to date. Select "Update ROM Library" in order to check for any updated or missing ROM files.
Once it's done checking you should see either a message telling you that you're all up to date, or a list of manufacturers and Rom files to download, From there you can download all of the files, or pick and choose what to download from the manufacturer, specific model, or just a single ROM file.
With your selected ROM files queued up, hit OK. then you can kick back and relax while the files are added in to your database,
When the download is completed, close out of the updater window and choose the newly available ROM file in your ProECU software,