Where would I get a copy? I always pay my software (pinocchio) ... however I would like to bring back memories by installing Windows 98
I suppose it wouldn't work on nowadays computers ... or am I mistaken?
Windows 98/98SE can be purchased off eBay. Of course as with most used software, Caveat Empor.
Systems with more than 1.5GB of RAM will enter a reboot loop. More than 512MB and the system is likely to hang frequently.
performance wise, Windows 98 tops out around 160MB as far as performance, with more memory sometimes even having a negative effective due to issues in the Virtual Memory Manager and various cache mechanisms. The issue then becomes whether you can actually install less than 512MB into a modern system at all.
Assuming you don't hit the memory limit, you might encounter other issues, usually in the form of the devices you use not having drivers. Win98 Also doesn't support any form of Multiprocessing, so on multi-core machines (pretty much the norm today) it will only use one core.
Generally the "best" way to run windows98 and 98SE is either on a system from the era or within a Virtual Machine.