Hi Nils,
If you order Adobe Photoshop Elements 2021 from Amazon (USA) you have three options (all currently at $99.99):
1. A physical DVD containing the Adobe Photoshop Elements 2021 software for both Mac & PC together with a serial number. (Supplied by Adorama - a well-established third-party vendor).
2. A redemption code for the Mac version, which you then redeem with Adobe to get your serial number.
3. A redemption code for the Windows version, which you then redeem with Adobe to get your serial number.
The redemption code will be listed in your Amazon account and you redeem the code with Adobe here:
Redeem
You will also need to download the software from Adobe too:
Download Adobe Photoshop Elements