Check your spam folder. You can still test version for by downloading the demo....I would wait for a few patches to be issues before moving any primary machine to V4..let the bugs get worked out.
I went to https://www.mycommerce.com/order-search and was able to find my order! From there you can find your license codes. Once I entered my codes I was able to update tp 4.0.0.6 and a lot of my problems were solved!