Some advice on how to use

This plugin is obviously still very early stage, so it has quite a few flaws and bugs. Firstly, you cannot choose which plugins specifically to check for compatibility, so if you have alot of plugins what happens is that the whole process inevitably stalls. Secondly, and more importantly, the plugin will just hang when it gets to certain plugins (e.g. Gravity Forms), and you will not get any results. For anyone using this plugin, what I’ve found that works with the current version is simply to deactivate any and all plugins that cause the compatibility check to simply hang, and then just run it on the existing active plugins. After that you can simply go thru the other plugins one by one and verify with the developer if it works with the version of PHP you are testing compatibility for. Unfortunately, I had to deactivate 16 plugins to get this compatiblity checker to work, so I’m not sure it really saved me any time at all.

https://www.ads-software.com/plugins/php-compatibility-checker/