Several items different.
1) The price is lower
2) Easy to retrieve activation/serial number directly from ipcam website.
3) Small discount over already discounted price, but only if you are a paid supporter of ipcamtalk.
4) Very large user community able to answer just about any question you may have about
Blue Iris. Note, do search for obvious answers to issues/questions on ipcamtalk before asking what may be considered a lazy or dumb question.
Best product/software purchase I have made in many years. Well worth the money.