Thank you for your interest in jsreport.
If I buy the one time enterprise license, I can only get updates for just next six months?
Yes
And, If a JSReport update comes and I am interested in, and the six months of updates have alredy finished, what would be the approximate price to be able to get that update?
We provided a discounted package for another 6 months of updates for this case. It costs 445$. Please contact our sales at sales@jsreport.net when the time comes.