I've got a lot of doubts about the advice above!
There are a small number of programs which are 'standalone' (i.e. they don't need to be installed on a computer). Such programs can simply be copied from one machine to another, e.g. by using a USB memory stick to carry out the transfer.
The vast majority of programs though need to be
installed on a computer. The installation process makes important changes to the computer's registry, which can't be copied across to another computer. The chances of you being able to move the program onto a different computer (even if it was an identical one) by simply copying and pasting the program files (as advocated by TTT) is zero. If it wasn't, software piracy would be rife!
The information in Chelle's link is perfectly valid but, as Scarlett hasn't got the program disc, it doesn't actually help here.
If you can get a program disk from somewhere, then it would be possible to transfer the software to a new machine but only if
(a) it's fully compatible with the new machine's hardware (e.g. some 32-bit programs won't run on a 64-bit machine) ;
(b) it's fully compatible with the new machine's operating system (many Windows 7 programs won't run under Windows 10) ; and
(c) you can extract the licence key from the older machine (which requires running a program like Belarc Advisor on it, in order to find out the information).
Given that the only discs available on eBay at the moment seem to be in German (or in other foreign languages), and that they're all priced at well over £300, I think that your chances of succeeding in your aim must be extremely slim.
I'm not even sure why you'd want Adobe Premier Pro anyway. There are better (or, at least, equally good) video editors available:
HitFilm Express is probably the closest alternative to Adobe Premier Pro:
https://fxhome.com/product/hitfilm-express
It's free and generally good enough for most home users (and for many business users too). If you just need a few add-ons though, you can buy them individually. Alternatively, the 'Pro' version (which has a free trial available) costs about £230.
DaVinci Resolve is widely used in Hollywood:
https://www.blackmagicdesign.com/products/davinciresolve/
It's free!
LightWorks has been used to make many award-winning Hollywood movies. The free version is limited to 720p output but is good enough for most people's needs. (The full version costs £360):
https://www.lwks.com/