This is a list of important software I have on my computer, that needs transferring when I upgrade. For example, you'll need to reactivate Windows and possibly other software as well. This will give you access to your software, but not without its own hassles. If your old computer is dead but the hard drive has survived, you can put the drive in a new computer and boot it up. In this case it may be difficult to transfer licenses and you might need to contact the manufacturer for support.
In some cases your old computer is not available, for example, you may have experienced catastrophic hard drive failure.
You'll still need any appropriate serial numbers, of course. If you can't find the original setup files (especially if you purchased the software by download), you can probably visit the manufacturer's website and download replacement software.Check your software versions and consider upgrading to the latest versions while you're thinking about it.Find the appropriate installation discs or setup executable files. Make a list of all the software you need to transfer.You may find that you need to keep referring to things on your old computer as you set up the new one.
If you purchase a new computer or significantly upgrade your existing one, you may find it quite a hassle to move your software to the new computer. Software Migration - Moving to a new computer