To download your video, just go to Video Settings. There you will see a download button. Please note that this will only appear if the video was uploaded to Spotlightr after May 6th 2021 (more info below). This will download the video in the original format that you uploaded.
As mentioned above, please note that this option is only available for videos that were uploaded after May 6th, 2021. To download a video that was uploaded before that, please enable the download option in your player controls. And then once you've downloaded it, you can disable that option from the player controls.
Please note that linked videos are not physically present in Spotlightr, therefore they can not be downloaded.