Joomla! Template JD Construct - Item Support

I have bought a Regular License but I am not able to install quick start on Joomla, 3.8.2.

Joomla says JInstaller: :Install: Не удалось найти XML

Please advise how to install it?
I also can't change Preset colors! Any advice? No support for this template?
Hi,
i has Problems with the bought template.

Go To Top, Sticky Header and the Menu on Smartphone dosn‘t work.

Can you help me?
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Item Name:
JD Construct
Author:
Downloads:
383
Sales:
12
Created:
2017-10-16
Item Version:
1.0.0
$39.00
Regular License
This item may be used for a single domain only.
$59.00
Extended License