the link
https://allroundautomations.com/plsqldev.html just at the time of reporting showed me the site for 'PL/SQL Developer 11.0', still having it opened, weird now that it shows 'PL/SQL Developer 12.0'.
same browser and no cache cleaned or anything..
got there from the pld 12 announcement from the main page
seems fine now, but wasnt at the time of reporting (at least for me but same browser new tab, so nothing changed on my side)
thanks anyway