These datasets are collected by the script Nemesis.
Each zip file contains JSON files with all ads classified as “political and issue ads,” on Facebook in all countries where ad transparency measures are available.
Each JSON file contains a maximum of 10.000 ads.
Data is archived in the form of a historical take collected on xx-yy-zzzz, and month-wise daily collection in the respective folders.
For more information on the scripts and the datasets, see here.