You picked the right area to ask these kinds of questions
As far as the purchase links, I just checked them out and they should be working. If you go to "Purchase ROBOTC" from the main site, it should take you to a page that gives you a choice to buy the CD or go through the Internet Download process.
I'm assuming you're choosing the internet download. So just click on that, and then click on the Single License link for both the ROBOTC for Mindstorms and ROBOTC for VEX.
A page will come up (which is our online store), and you just have to go through that process to purchase a license for ROBOTC.
When you "activate" ROBOTC, and you install an "updated" version of ROBOTC, it will automatically recognize that you have already done so, so the new updates will already be unlocked for you. There is no cost for ROBOTC v1.x updates, you just have to download them.
If you have a special case where your computer has crashed several times, then you will have to contact us to work with you on resetting your activations.
I hope this answers all of your questions.
Vu NguyenSoftware Training Development Team
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