A package has a timestamp : 1661372830 = Wednesday 24 August 2022 20:27:10 (cf https://www.epochconverter.com/
In folder /download/1661372830 there is 2 files (or more) : info and 1661372830-1 (and -2 ...).
The 'info' file give informations about usage of package : type (store/execute), action to launch, ... (usually the file downloaded using https)
The xxxx-1 file is fragment of file supplyed by package : allways it's a compressed file (zip for Windows, tar gz for Linux).
For testing, you need to get the file : read 'info' file = is it correct ?, get fragment, rename it as .zip extract it = is it correct ?