The proper thing to do is to find a compatible plugin. Reverting to old versions of WP to keep compatibility of a theme or plugin could lead to your site being compromised. Always run latest version of WP with compatible plugins/themes.
That said, you will need both the full DB export and full site files backup (as always noted when updates are to be done) to revert. Do you have those?
You could export all post etc using the export tool, rebuild your site manually to 3.7.1 and then import them (but see first paragraph).