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.

after installing the quick template, no graphics are displayed and errors appear
http://www.beton.ogicom.pl/index.php/pl/
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Item Name:
JD Construct
Author:
Downloads:
902
Sales:
22
Created:
2017-10-16
Updated:
2020-09-25
Item Version:
1.2.0
Supported Joomla:
Joomla 3 Product