They're not working again. Are there other urls to follow? I have to admit that sometimes this documentation link works but in some periods of time, I can't have an access to it. Can it be related to the fact that I sometimes use VPNs and proxies? Are they banned on opalstack or smth?
Honestly, I've been working with documentation tools for just 2 months and I hope there's a way to avoid such problems. For example, recently I"ve discovered useful software https://clickhelp.com/ which is related to online documentation settings, correct urls, search engines. I think opalstack needs to find ways to fix the issue forever.