Step 1: Go to https://accounts.wondershare.de/web/login
Step 2: Log in or register
Step 3: After logging in, click on Redeem
Step 4: Click on Serial Number and copy + paste the number
Step 5: Then you need to open the software and log in with your Wondershare account
Download link:
Windows: https://download.wondershare.net/inst/de-pdfelement-pro_setup_full5476.exe
MAC: https://download.wondershare.com/inst/mac-pdfelement_setup_full5237.dmg