Directory for WOTLK usually looks like this:c:\program files (x86)\World of Warcraft\_classic_\Interface\AddOnsDirectory for Hardcore / Era usually looks like this:c:\program files (x86)\World of Warcraft\_classic_era_\Interface\AddOns
On servers that support questlinks, a shift-click on a selected quest will add a questlink into chat. Those links are similar to the known questlinks from TBC+ and are compatible to ones produced byShaguQuest,QuestieandQuestLink. Please be aware that some servers (e.g Kronos) are blocking...