Dear Arif Rahman,
I'm sorry about this late. You've registered successfully before this answer comes. Thank you for that
About your questions, i can reply as:
1. if I register as a personal JTC if I can get the service installation? if not, what the next process?
==> You can't get the service installation if you have only JTC account. You have an account of JTC. It means, you're allowed to download all packages of templates. They're our products. And Installation is one of our services. Products and services are differ. So if you can't install our template by yourself, you should buy package installation in this link:
www.smartaddons.com/products?page=shop.product_details&flypage=flypage.tpl&product_id=215. We'll install the template for you.
2. if you put a template on my web Quickstarts whether the data from the data template replacing my existing website? (I've experienced it and would not happen again)
=> I'm sorry i haven't understand about this question. Do you want to install a new template with old data? If we put a new template with quickstart, you will receive the website which likes as our demo (with all extensions and example data of us - not your data)
Some information hope to help you
Please contact with us by tickets - Presale/Download if you don't know anything about products and services
or tickets - Technical if you want to support resolving any issues which occur with our templates in here:
www.smartaddons.com/support/tickets
Thank you!