been with zencart for 15 years. Our developer passed away and now our site is down. Can you help

I've been using ZenCart for my business for 15 years and unfortunately, my site has come to a sudden halt. Our developer recently passed away and now the site is completely down. I don't have any recent backup files to help restore the website, and I'm not sure of the current version of ZenCart that I'm using.
I'm looking for an experienced ZenCart specialist to help get the website functioning again. If you're able to assist me with my concerns, please let me know – I'm eager to restore our store and get back to doing business.