This just isn't going to work. The installation for the latest versions is totally integrated with the Steinberg servers - they know what you have, they talk to your computer and offer you downloads of what you have in your elicenser. For years now Cubase in the Pro version needs a hardware USB licence dongle. The versions such as Artiste and element can run on an elicenser but that checks with Steinberg regularly and if it is unhappy - maybe you moved a few plug ins or simple stuff, you need to run what it calls maintenance tasks. Without internet connections, it's a total pain, as I found out when my router died. So many things stopped working - innocent stuff like VSTi synths, and of course all the latest sound packs and upgrades to everyday tools require constant updating.
I'm not even sure there are old Cubase versions on the site any longer that will work with XP - frankly, from the legacy XP computer I keep for a few apps, it's on it's last legs.
Also be aware Cubase has HUGE cleverness now and you can do amazingly useful stuff, but Windows 10 or Mac latest OS is almost essential. I fear you are not going to find any way to do this. You can go to a friends house and on his computer download cubase, buy a dongle and then go to your house with the download on the USB drive. Then cubase says it needs to download X or Y to complete the installation and you go back to your friends - but how do you get back to the place in your install? Maybe you could take your computer to somebody with a net connection and just install it there? If you can find an old version compatible with XP and get it running, you go home and in the first song, click on the drum machine and up comes the message, sample xyz123 is missing, click here to download ........
Internet connection is not just useful, it's essential. Your distance from civilsation, old computer and by neccesity old software is going to be painful. Mind you with the cost of the software, is there not a solution to internet coverage that would enable you to use computers - XP hardly even counts as a modern computer any longer. XP is not supported and a dinosaur. Windows 10 is on all my PCs and works fine and is stable - there's simply no musical sense in staying on it.