To download them, go to this page: https://stickers.cloud/en/pack/Dishonored and click on “ADD TO WHATSAPP” or “ADD TO TELEGRAM” or “ADD TO SIGNAL”, depending on which OS you are running (iOS or Android) and which app you want to use them on.
Those stickers are uploaded through an app called “WSTicK” on iOS and “Stickers Cloud & Sticker Maker” on Android. You will need the app to install them on your WhatsApp but the whole process is free. Only annoyance is the ads when you open the app that one time to install the stickers.
If you want more themed stickers, check my Stickers Cloud page for mor R6S, RDR2, IT movie, Anno 1800 and Destiny stickers !