I have bought the plug in twice. First, it was for my blog (theme is Tracks), it works perfectly. So I bought it once again for another blog which is not online at the moment (Theme Avada) and it doesn’t work at all ! Could you help me please ?
For me it seems the installation was incomplete, thus my advice to install the plugin again.
If all plugin files are there the include_path variable can be the reason since the plugin’s path is not included in this variable. That is not a plugin issue but a server issue. In that case your webspace provider would help you.