I’m trying to evaluate SLES 15 RC4 but without an eval license, I am only able to perform a minimal install. On the main website it looks like there are only options for obtaining an eval license for SLES 12. Thanks!
Hi and welcome to the Forum 
You need to join the beta (which is almost over), else wait a bit for the release…
https://www.suse.com/betaprogram/sle-beta/
https://www.suse.com/betaprogram/sle-beta/#faq-reg