I don’t think this is the reason. I contacted the hosting provider, but as you can see in Server Requirements, all requirements are met.
I reinstalled a fresh copy of wordpress and theme and now when I try to import the default demo, I get the message that the pages etc can’t be created.
I don’t know how to send you screenshots to see what I’m talking about, but if you want, you can try to install the default demo and see what happens.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.