I had the same problem. I tried everything, reinstalled etc. always same result, 2 seconds appear then disappear. Then i installed the game with an earlier version of the launcher. That helped me
i could log on
but…
Until now
Now this older version does not connect
i get this
This site can’t be reached
The webpage at EVE Online Launcher might be temporarily down or it may have moved permanently to a new web address.
I has same problem. (Windows 8.1, Steam client)
I resolve my problem by deleting dir C:\Users\%UserName%\AppData\Local\CCP\EVE\QtWebEngine\Default\Service Worker\CacheStorage
Now launcher works ok.
Had the same issue as you all had. The RegEdit CCP folder deletion does nothing, HOWEVER, the solution below did work-
Delete the last folder in this address, then reopen your launcher. Works like a charm-
I kept getting an error regarding permissions for the folder in question. I had to go to the sub-folders inside of it and try to open each one. The allow permission pop-up granted access to each sub folder separately. I was able to delete it AND it fixed my problem.