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?
Hi I get this blank page when submitting JD Construct form

{"success":true,"message":null,"messages":null,"data":"
Thank you. Mail has sent :)<\/div>"}

I
if you have fixed this issue why don't you include this in the template download and make it upto date.

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Item Name:
JD Construct
Author:
Downloads:
608
Sales:
19
Created:
2017-10-16
Updated:
2018-11-13
Item Version:
1.1.0
$39.00
Regular License
This item may be used for a single domain only.
$59.00
Extended License