Build previous JQM versions? (1.4.2)

Build previous JQM versions? (1.4.2)

Hey there, I foolishly jumped right in and spent hours upgrading everything in my current project to the latest version of jQuery mobile, 1.4.3, only to find out it's buggy and has a serious, site breaking issue. I would like to build a custom, older version of JQM although I can't find anywhere the option to do so. 
Let me know if you have an idea of how to do this.