• Search for the VM at https://sevire.rwth-aachen.de/en/vsh/vms and follow the corresponding link under "vCenter link".
• Log in to the vCenter server with your serverhosting account.
• Look for the tile "VM Hardware" and select "Connect to datastore ISO file" from the dropdown menu:

• You get to the following view: 

• Please select the image and then press "ok". 
• Perform a "soft reset" (reboot) of the system via the console to start the installation (CTRL + ALT + Paste).

Important! After successful installation of the operating system, please remember to install VMWare Tools in order to use the full scope and performance of your VM: VM Tools Installation