Possible to downgrade?

Hello there, first of all thank you so much for creating this great plugin which basically saved my life!

I recently had the brilliant idea of upgrading Robokassa for WooCommerce to the latest version, which gives me a server error… ?? This, though, did not happen with the previous release of your plugin, which worked perfectly with wp ver. 3.5.1

Is there a way to get my hands on the previous version until this latest one (0.8.2) works with my set-up?

Spasivo bolshoya!

https://www.ads-software.com/extend/plugins/robokassa-for-woocommerce/