Sulliadm

I'm trying to find a proof of purchase/receipt of sale for buying my UnRAID key. Also I apologize if this is the wrong forum to post this kinda question in.

Hello everyone, I feel like an idiot but I keep getting issues with connecting Let's Encrypt with OwnCloud. It probably didn't help that I followed the tutorial on connecting it to NextCloud, but over the past few days I've been trying to set it up everything boils down to a 502 error, and the past few times winds up with 404s. Does anyone know of a walk-through that explains everything?