Adobe no longer officially supports CC 2018, but if you have a Creative Cloud subscription, you can usually still download older versions via the "Other Versions" menu in the Creative Cloud app.
Plugins that worked perfectly six months ago can break after a Windows update. Photoshop CC 2018 loads all plugins from C:\Program Files\Adobe\Adobe Photoshop CC 2018\Plug-ins . adobe photoshop cc 2018 has stopped working