Yeah the download button is for the cloud recording, which if you’re a non-subscriber, is just a still frame, so not much use.
I believe it was posted in here recently that there is something extra you need to do with the battery “outdoor” cams to get them to record to SD.
Look at this post by @Antonius for details
Honestly the Battery Cam Pro is a huge step up from what you have, understood you may not want to shell out more money but those cams are old enough it is worth considering an upgrade, everything works better on them. The only catch is that because they let you do more stuff and make them more sensitive, if you want the same long battery life you need to disable some of the new features and possibly turn down sensitivity etc.
Of course wired cams are even better (and cheaper) and a battery bank with solar panel can run them for quite some time (or even just a big battery bank that you charge manually from time to time).