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We introduced the plugin’s pro version in 2015, but the zoom functionality in the plugin’s free version was never disabled or removed. The zoom should work alright in the plugin’s free version.
Would you make sure to tick the “Enable the zoom on mobile devices” option on the “WP Admin -> WP Image Zoom -> General Settings”? Afterwards the zoom should work on mobiles.
Nevertheless, if you insist on using an older version of the plugin, then you can download it from this page and install it on the website. Alternatively, you can use a plugin similar to WP Rollback.