Elder scrolls online does not start from Steam

Solution 1:

I found a solution:

  1. I tried running the zosSteamStarter.exe in thesteamapps\common\Zenimax Online folder.
  2. At first I had the problem, that a Windows message poped up saying that the execution of the code cannot be continued as the MSVCR100.dll and MSVCP100.dll files couldn't be found.
  3. After installing both .dll files (following these German instructions) I got the error message that the application couldn't be started correctly (error (0xc000007b)).
  4. To solve this problem I followed the instructions in this video, which didn't remove the error (0xc000007b) but might have done something else beneficial.
  5. After following the instructions in this video, I finnaly managed to start the zosSteamStarter.exe without the error (0xc000007b). After some installation I was shown the normal ESO-launcher, which was updated (installing/downloading several patches - some having a size of several GB).
  6. During the updating, I got the message "Error 206 - PatchmanifestError_UnzipFailed Unable to decompress patch manifest data. Please restart the launcher and try again. If the issue persists, please run a a repair. If this does not resolve your issue, run the Game Consultant Tool (located under Launcher Settings -> About) and contact customer support." As there still was the "PLAY" button in the ESO-launcher I clicked it which started the "normal" loading screen (Bethesda, Zenimax and Havok logos and game music) and with some licence to agree to.
  7. Then the message "LOGIN ERROR Unable to initialize connection to Steam. Please ensure the game was launched through Steam or try again later." appeared.
  8. I quit the game and started the ESO-launcher from Steam (in admin mode), which now worked. Also starting the game from the launcher worked, this time without the error message from point 7. Also logging into the game (and playing) worked.
  9. I also tested whether starting the ESO-launcher from Steam (and playing ESO) without admin mode works. The answer is Yes!