Dear msudiva2!
There’re 2 ways for you in this case:
1. Use your old site, download all packages of ja community plus (except quickstart package), install packages one by one and make configuration for them like the user guide:
http://www.joomlart.com/forums/topic/ja-community-plus-userguide-old/
You will have our template working well in your old site if you do correctly.
2. Create new folder in your host (example “test”) and more a database (“test”). Download our quickstart package, upload to your test folder then run this address:
http://yoursite/test
install the quickstart package with “test” database.
After finishing install, please re install and make config for extensions that you need in old site to the new.
Please try!
Regards!