When I use the desktop shortcut, the webpage says I must install the game, it doesn't matter how many times I do this, the page will not refresh to show the play link. When I go to the community website, the link refreshes and still only shows Install. All I did was logout and reboot my PC due to flashing texture artifacts in your game, now neither the Lineage2 EU or the classic work.
I even turned off IOBit lol. I resolved it by clearing all caches as the login system relies on a browser, and using yet a different browser. I assume you are using cookies to discover if the game is installed? If so, then they are not always refreshed when something physical changes and are probably stuck in a cache loop. Turning off IOBIT did nothing to correct the issue, so it is merrily running along to its hearts content and mine as well.
I did not check, however, as the same 'bug' effected the NCSoft client, I contacted their support team, they suggested that I uninstall Razor Comms programme, which I did, now it works fine on all browsers.