I just put another drive in my testing computer. It had a Windows 7 install on it (for the testing computer). I downloaded and installed the original preview release, then downloaded and installed the updated release. Everything seemed to go well but I again saw blurred fonts and slower response times. This time, installing the two updates from Windows Update seemed to cure both problems.
And the check for new builds feature remains on this install after the updates.
This install is 32 bit so I saved the esd from the upgrade. Easy way to find it is to install Search Everything beforehand. Let Everything build its database. Then when you do the upgrade, prior to clicking the INSTALL button, search Everything for *.esd .