is this compatible with wordpress 4.6 rc2?

Just an FYI, as I see you post a lot of threads like this. 🙂

In general, these thread’s aren’t necessary for a few reasons:

1. All plugin authors are emailed before RC1 and asked to test and update their plugin’s compatibility listing. Here are the details on the email for 4.6 sent July 28: https://make.wordpress.org/plugins/2016/07/28/reminder-wordpress-4-6-is-imminent-are-your-plugins-ready-also-make-sure-your-email-is-valid/

2. In the plugin listing’s sidebar https://wordpress.org/plugins/site-sensor/ in this case, there’s a “Compatible up to:” listing. In this case, it’s compatible up to WordPress 3.5.2, so I think it’s really unlikely that the developer will be stopping by to change that any time soon. Take a look at https://wordpress.org/plugins/stops-core-theme-and-plugin-updates/ for an example of a plugin which already lists compatibility with 4.6.

3. With that said though, it’s possible the plugin may still work. Look back at that same sidebar and scroll to the bottom. You’ll see a poll where users can essentially vote on whether or not the plugin works with their version of WordPress. In this case, no votes on 4.5.3, so you might need to test this yourself. Take a look at https://wordpress.org/plugins/limit-login-attempts/ for an example of plugin which has been abandoned but still receives compatibility votes.