Links:

1. https://www.java.com/en/download/
2. https://www.sql-workbench.eu/download-archive.html (IMPORTANT UPDATE! As of 2022-10-10, in some countries the sql-workbench.eu website doesn't work. I don't know why but just in case I've uploaded the installation files to my Google Drive, too. You can find them here: SQL Workbench backup files.)
3. https://jdbc.postgresql.org/download/#latest-versions (Important As of 2022-10-23 this is the new link that you should follow. The video shows a different link, as it's not updated yet -- but this is the correct one.)