SHOPOWNERS As of 4th July 2019, most shopowners will want the PHOENIX download. https://github.com/gburton/Responsive-osCommerce/releases PHOENIX: Phoenix has osCommerce 2.3.4.1 as its foundation.  It uses Bootstrap 4 in the Shop Side.

FROZEN: Frozen has osCommerce 2.3.4.1 as its foundation.  It uses Bootstrap 3 in the Shop Side.
Frozen is now in Sunset Status with EOL slated for 31 December 2019 GOLD: EOL   Developers
You do you, you know what's best for your needs.