I've installed in my two different computers with Windows 10. One 32bit without Anniversary Update, one 64 bit with Anniversary Update.
First, I installed over v9 with a "Successfully installed" in both my 32 and 64 bit machines.
I then could open the antivirus window and update the definitions.
After a restart in both machines, the antivirus is gone. It doesn't start with Windows. It doesn't open when I click it in Start Menu.
If I try to uninstall through Control Panel, I get a "can't remove ESET services" error. I uninstalled manually and the reinstalled again v10.
Same problem again. It opens the antivirus window after installing but when I restart, antivirus is gone again.
I manually uninstall for the second time.
Then I installed v9 and everything is working as before, both in 32 and 64 bit with.
I have the Comodo Firewall installed in both my computers.