Thanks for your help.  I'm glad I was able to let you know about wget2.  Searching for wget in Muon also shows pwget which is described as a downloader utility which resembles wget but implemented in perl.    Also python-3-wget.

wget --ca-certificate=/etc/ssl/certs/USERTrust_RSA_Certification_Authority.pem wget https://www.gutenberg.org/ebooks/68992.epub.images worked.  There has to be some way to tell wget where the certificate file is without having to use the  --ca-certificate option.  That's my next project.  Thanks to everyone for your help.