Namecheap is not supportive at all with LetsEncrypt and Zero SSL. I installed ZERO SSL before bec it offers SSL for free and I renew it every 3 mos, but now they set a limit on a domain and is forcing you to purchase their Basic Package of $10/mo which is way more expensive than other affordable SSL. So I tried installing letsencrypt but main prob that's appearing is I think that ACME.sh is reading that my site is under defaul SSL with zerossl even if right now I don't have any SSL on the site. I also deleted already my zerossl on my site but still when I checked acme.sh folder it states that API is zerossl. I don't know if I can delete this or not. I asked Namecheap.com support but they say that's it's out of their scope.