I checked the server and database,found some mistakes made by your coder,that's why he needs to access into the database to modify something:
1、 he should change the configuration (home url/site url,user password) of the demo site before directly installing on my website.This will cause several technical problems.When that happens,It must modify the database to fix all the problems.
2、It‘s not a good idea to replace whole of my website data with your demo site,it's not safety.What you provide should be demo,not include personal data.
You should test your demo installation document step by step with a pure clean environment before you sell the theme to your customers.This will give a none professional impression when they found the installation guide is of no use and need to ask for help.
Maybe you have do your best to provide your service,but time is money.It's better for you an me to give up any further attempt.I will turn to other theme,please accept the refund requirement.Thanks for your effort !
