Best answer by YegorP
Regarding your cloud concerns, my colleague Mike https:///t5/Webroot-SecureAnywhere-Antivirus/Technical-question-How-WB-scans-whole-PC/m-p/6180/highlight/true#M196 a great explanation about how Webroot SecureAnywhere still protects your computer when offline. I think you'll find the post very useful.
To your second question, while SecureAnywhere is in fact compatible with pretty much any other antivirus program, it cannot run in conjunction with our own older product(s) for a couple of reasons. First of all, the SecureAnywhere installer has parts of the removal tool built in (that remove the older product upon installation) so if it happens not to fully remove the older product, it will always remove parts, making it lose functionality. Again, this is out of the norm, so we always give customers the link/instructions to run the removal tool if remnants of the older product happen to remain. The second (and main) reason why the two programs can't run together is because they share installation registry keys and because of this, Windows won't let them coexist. So hypothetically, if you were to try to install the older product after SecureAnywhere was already on your computer, the download would fail because the install key is the same and your computer would "think" that the older product was already installed.
*By the way, the instructions and link for the removal tool can be found in this https:///t5/Webroot-SecureAnywhere-Antivirus/Two-versions-of-Webroot-installed-at-once/ta-p/6914
Hope that clears things up. Let me know if you have any more questions.