You could save disks, by using a usb install drive. there was a thread here today about it. Or use dvdrw disks.
You don't have to enter a key during installation and untick the 'Activate on Line' box. When installation is complete you will be in 30 day trial mode.
According to the Everest screen-shot in your first post you have a HP slic (HPQOEM), so you need the HP.XRM-MS certificate.