There are two plugins installation problem in Realia theme importing.
1. After Widget Logic install and activate, the main page would become whole blank.2. WP REST API can not install, there is a message: Something went wrong with the plugin API.
Attached files: wp rest api install window.png
I also encounter the same error you
As my experience,
1. you can find other logic plug-in to instead. If the Widget Logic is used to get better control over your widgets. Easily show or hide WordPress widgets on specified pages & devices and/or assign custom alignment.
2. maybe another REST API plug-in can instead.
After all, I give up this theme. Because there is too much un-determine factor and no support reply.