Hello Pandapika,
i always change my notebook every 2 years..
You can transfer your license from your old machine to your new machine.
Just before changing over, you have to deactivate the license from your old machine. You can do it from HELP => License Code menu:

When you deactivate you license code, the program notifies my license server, that you'll not use this license code on this machine for the future. Doing this, the license server frees one license slot for you for activating on another machine.
Now you activate the same license code on your new machine.
If i buy single machine option of FSB pro, & install it in my notebook, then my notebook get broken..
If your machine got broken and you cannot deactivate the license from there, you can send me an email or PM (personal message) from the forum for the vent. You have to include the order number, and the registration email. Then, I can deactivate the broken machine manually.
Until we resolve the case, you can install the software on your new machine and use it on a trial mode with its full functionality.
How long are u gonna develop this software in the future? 5 years more? 10 years more?
I cannot be sure, but developing this software is my passion and my hobby. I'm doing it from 10 years and I cannot imagine how and why I can stop. Most probably I'll continue developing software till I'm capable to do it.
if i really buy this software, did i just download FSB pro from internet, or get hardcopy of it? (CD, Dvd)
First you have to download and install the program from the Download page. It will start in a trial mode. When you test it and find it useful, you just purchase a license code. After the purchasing, you'll receive an email with your registration details and a license code. Then you can activate the license code on your
machine and the program will switch over to "registered" mode.
You have to keep the registration email safe, because you'll need the license code if you decide to change your computer. It's best to store it on a private digital store online
You don't need to archive the program itself, because you can always download the latest version from our website.