Just noticed that when in Imperial City Sewers, to buy the Fragment of the Vampire from the merchant, you need to own the Season of the Worm Cult to purchase this. WHY? If it was for a new style fragment that normally has to be collected from Solstice I could understand this, but this lead drops from Kyne's Aegis trial in Western Skyrim. An area I have access to. I am generally a solo player, (so no real chance of trials), so this should be my chance to have got this lead. But it seems if you haven't upgraded you are out of luck.
As an aside, how about the screen reminding you to "Enter code" or "upgrade" to the SotWC, that I have to skip past each time I play, be removed? Its already mentioned on the character select screen, the wayshrine on Solstice is greyed out and mentions upgrading if you hover over it, as well as it being on the first log in screen (along with crowns that appear to have on sale for a while now. I wonder why that is!). I know I can upgrade, but for the 1st time since I purchased ESO, I don't want to upgrade, and I am seriously considering stopping my eso+ subscription. So please stop reminding me to do so (and now trying to force for items you shouldn't need it for).