I saw a template, where should I buy it? Is themeforest or your website?
Support for joomla 3.8.10 and PHP 7.x?
How long is the continuous update?

Dear sir,

Thank you for being interesting in our theme.
About Joomla 3.8.10 and PHP 7.x, you can check this information in the description of the template, each one also is detailed
Secondly, you can buy the template on Themeforest or on our site, if you buy on Themeforest, you may get support later than our site a little bit.
And others ( code/updates/ guide , etc) is the same.

Thank you! If there is any question, let us know soon

I saw the phrase "the maximum number of downloads for each file is: 5 Download until 90 days after the first download" in the email. It means that you can't download it again after 90 days?

Dear win3000@126.com

yes, you can't download it again after 90 days.
you can buy our club here for 1year to download all extensions, templates www.smartaddons.com/pricing

thanks