I still fire up 2.8 every so often. It was the last (best) Windows version before the silly client / server stuff was brought in (DXP, Altium etc). 98 was the first useful version of that client / server naffness that worked ok IMO. I paid for the naffness, but was effectively stuck on 2.8 for years until they sorted themselves out.
I was originally irritated by 99 and its DDB naffness (but that has its handy sides). But same problem, I upgraded to whatever the 2006 version was but despite being on that bandwagon I effectively didn't use Altium until about 2013. It's like flushing money down the toilet, the flip side is 99SE worked and was very popular and I got work. I use 99SE all the time - about half my clients still use it, though that number is dropping, and it's rarely used for the big boards these days, so in reality it has fallen behind (mostly used for pumping out small revision updates). 99SE does import 2.8 very well, but I think Altium imports 2.8 fine as well.
I'm kind of stuck on AD13 now, due to our last government bringing in rules which restrict companies where an owner has a relative with a disability from making capex purchases, and significantly more evil stuff like that (but that's the way the whole world seems to be going). At least it's a fairly good version too.