You'll always have unlimited access to download all paid projects sent for editing.
To retrieve your edits, simply visit the Projects page and find the specific project you're looking for. Once you've located it, on the right side of the project row, click on the three dots and choose "Download edits."
If your Lightroom catalog has not been moved from its original location (where it was when you uploaded the project), it will automatically load when selecting the project.
If it has been moved from that location, you can use the 'Browse' button to locate the relevant Lightroom catalog."
The Lightroom catalog doesn’t have to be the same catalog. As long as it has the original images sent for editing and the same folder structure, Imagen will have no problems downloading the edit.