Problems with demo template

I have downloaded it_restaurant 3 template and installed it. It is working fine (
But, the administrator page is not working fine. It was installed with joomla version 3.1.4, and this version there is a known problem when try to access Module manager, or articles.
The error 500, "Layout Default not found". I updated my joomla version to 3.6.5 version, and problema was partial solved. Now, i can access Module Manager, but when i click under some module, it shows a white page, without any information.
Pls, i need to solve this problem because i hope to buy this template, but first i need to make some changes to show it for my client.
Can you help me, PLS?

Thanks advanced.
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