I also upgraded to Windows 10, however, Start8 continued to work perfectly. My problem is that when Start8 tries to upgrade to a newer version of Start8, it always fails with this error message: "The following minimum system requirement for this setup were not met: Operating System: Windows 8, Windows Server 2012, Windows 8.1, Windows Server 2012 R2 The setup will now abort."
Not sure what to do about this as I can no longer intall updates to Start8.
This is a known bug in the update. I understand we will be updating that next week to rectify it. You can set it to Win8 compatibility mode to bypass that message for now. It should be noted there are known issues with Start8 on Windows 10 such as the search bar overlapping the taskbar icons, wrong OS colour matching, the icons for Universal apps appearing incorrectly and additional apps listed which are not for users to ever launch along with some other problems, but it was not our aim to intentionally block the use of Start8 on Windows 10.
We have released Start10 this week which has some enhancements other than fixes over and above Start8 and I recommend looking at the start10 website in case any of these appeal though. See www.start10.com The taskbar features are especially nice along with the new style, new start button recolouring to match the taskbar, option to use cortana search over Start10 search, tile view mode etc.