Question about Microsoft Windows 10 Home

You only need this product for the installation key. You can create a bootable USB stick with an existing PC. Google "Windows 10 media creation tool". With the help of this programme you can create a USB stick (min. 8GB) with the desired version of Windows 10, in your case Windows 10 Home 64-bit German. Then you can start the PC from the USB stick and install Windows 10.

You no longer need a DVD drive. You can download the "Media Creation Tool for Windows 10" from the Microsoft download page and create a Windows 10 setup USB stick. However, you need a different PC and a USB stick of at least 8GB.