Envato support policies are available here:
https://codecanyon.net/page/item_support_policy

2. Installation and customization are paid services: https://affiliatepro.org/company-services/

3. Please don’t ask for support in the comments area or any other communication channel (email, social media chat, website contact). Usually, you will get the answer “Please create a ticket in our support system” and in this case, we BOTH saved our time.

4. You can’t get a refund once the item has been downloaded in any circumstances, check Envato refund policies https://themeforest.net/page/author_refund_policy