I remember when all software came on magnetic floppy disks, sometimes on one, but later on many and even installing Windows 3.11 required a large number of disk changes, you couldn’t just set it going and leave it like today. I still have a copy of that version of Windows and of Borland C++ which came with a huge box of reference books and a similarly huge number of disks – both the smaller 3.5″ ones and the older 5.25″ ones – you really felt like you were getting your money’s worth. You’d put the first disk in and wait for what seemed like an eternity until the installer would flash a message up saying “Please insert disk 2” and you’d search through the stack if you’d somehow shuffled them and hope that it wasn’t missing – either not supplied, or lost if you were reinstalling. Then the waiting would continue and repeat until disk 10. Fun times.
Since then we’ve been through CDs and DVDs and now thanks to high speed broadband you can even download a whole operating system in just a few small hours, or so it seemed to me when I did it a couple of months back with Windows 10. At each stage it was possible to shortcut the earlier process by copying the floppy disks onto a single CD, and then later copying whole CDs onto a large USB stick or portable hard drive though Windows can still use a DVD to install.
Because of all the disks, and the boxes in which to distribute them manufacturers in the past couldn’t keep selling old versions of software due to the manufacturing costs and the space required to warehouse them though some companies such as Serif would sell old versions cheaply alongside new ones for a while. Today though with downloadable software they can keep supplying old versions for much longer which is useful when you have old hardware that needs old software. Sometimes you’ll have an old computer that won’t run a 64 bit version of windows for example but new software won’t work on 32 bit windows, the newer version is incompatible with all or part your computer, or, as I found out, you buy an old negative scanner and the software disk that came with it was unreadable and the current version won’t work, luckily though the manufacturer still sells the old one via their website – preventing the new hardware becoming an expensive paperweight, or in the scanner’s case doorstop. Many freeware, shareware or low cost independent software authors have an archive of old versions on their websites.
In other cases old, usually free, software or device drivers that have been rendered obsolete or the manufacturer has just decided not to continue developing them anymore can still be obtained via individuals uploading and archive copy to a download service. Again this is helpful as some older utilities have been replaced by newer, slower, clunkier “improved” replacements and you don’t have the option of the old program you liked – where the old version is either automatically upgraded or doesn’t come with a new operating system or application. This may also be true for paid for applications so long as you have the correct licence to install them.
Then there are the people who have managed to get really old software to run on modern PCs, like a Windows 3 emulator for that nineties computing experience. I had a Super Nintendo emulator to play games on my PC once but it just wasn’t the same so I bought a second hand real one instead.