Spybot 2.4 runs fine on current Windows 10 test versions, even if the Windows Upgrade Advisor advises otherwise.
Microsoft has announced, on a page no longer online, that they will uninstall antimalware software on an Windows 10 upgrade, and re-install it only for those with a valid subscription.
In our tests, current builds of Windows 10 do not show this behaviour yet. And so far, no one at Microsoft seems to know or be able to tell how a valid subscription is defined.
Should the upgrade, once it is published on July 29th, remove Spybot, please re-install Spybot. Customers of paid editions can use the email link they received.
If it should become necessary and possible for us to update Spybot to make the Windows upgrade easier, we’ll react immediately and release Spybot 2.5 to cover Microsofts requirements.