I purchased this theme 2 years ago and in the demo selector page https://addons.prestashop.com/demo/FO13518.html you can see that there are 2 versions, Zro03 and ZOne and in the Zro03 area you can se this:
Zro03 - PrestaShop 1.6.1.x
"The final version of Zro03 theme is v1.14 (June 04th, 2018)" and the under ZOne, this,
and in the ZOne area this:
ZOne - PrestaShop 1.7.x
We update ZOne theme regularly
but the thing is that when I download my purchased "Zro03" version from the prestashop website I get a zip called "vx.x.x-ZOneTheme.zip"