The best I can advise is to contact BobCAD and ask them if they still have 21 on a server somewhere but I very much doubt it
Also it is unlikely that 21 will run a new computer, probably the one you have just purchased will have Windows 10 64 bit Operating System, I think that 21 will only run on the old 32 bit Operating system like XP and these days Motherboards in computers are designed to work specifically with certain Operating Systems
What exactly happened to your old Laptop? If you haven`t thrown it away it might be worth going to a good PC shop and asking if they could "clone" the old Hard Drive onto a newer one and finding an older PC/Laptop to run it on.
Failing that you will have to buy something, I don`t know what your business is but I would reckon you will have many, many programs done in 21 that will be lost to you !!
I still have an old PC with 21 on it and also the full set of discs and the huge Manual that used to come with 21
Purchased way back in 2006!!
I am in the UK so not a lot of use to you but maybe you can find someone in the US who can loan you a disc to load it from as long as you still have your original Invoice/Authorisation codes you should be able to get going again although unless you had your programs saved off your laptop they will be lost
I still reckon that trying to get your old Hard Drive "cloned" would be the best way to go as I am sure you would be able to pick up a cheap PC to run it on, worth asking a shop if they can do it for you, doesn`t cost to ask
Regards
Rob