You can't change the computer during the licensed period.
Only we can do is issuing another serial number of yearly license at a certain handling fee. We charge 1/12 of regular price per month (round up a period shorter than a month) after the purchase to set off. The calculation is based on regular prices, not on the discounted rate you might had gotten. We don't reissue serial numbers for monthly license.
Example
You buy a Plug-in Set 1 year license on 10th January and your PC breaks on 20th March, we reissue a new serial number at a cost of 299 * 3/12 = 74.75 USD, because 2 months and 10 days passed.
The new serial number generates another one year license regardless of the old expiry date. So if you pay for 1 year and 3 months, and are licensed for 1 year and 3 months in total.