New
#11
First of all, it's far from certain that 10240 is the RTM. If you can find an ISO of 10240 that you feel like trusting, you can indeed use it to upgrade your 8.1 and tinker around. But first you'll want to make an image of your 8.1 system to put back on to catch the official upgrade - I'm pretty sure they are not accepting new members to the Insiders Program at this time (could be wrong - there is so much misinformation going around regarding all things Win10 that it's hard to know what's really the deal).