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League of Legends is not starting - what to do?

  • Oct 11, 2025
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League of Legends is a Free-to-Play game, which many Fans glued to the Monitor. But what to do when the MOBA starts? Below, we have compiled for you the most common causes and the matching solution paths.

Error message: "League of Legends cannot start."

With the free online game "League of Legends" to compete with your friends as a Team against the enemy team, to put on the "fields of justice" their strategic approach and their capacity for teamwork. More and more users complain, however, that the MOBA to start properly, or is immediately interrupted. If you are affected, you should check whether or not any of the following causes for the Problem is responsible.
  • For League of Legends an active Internet connection is required, so you can play with your friends online. In addition, it is important that the Server of your Region are online.
  • If League of Legends does not start, it may be that you have not installed the latest Software on your Computer. For this reason, you should always update all of the programs, which the game uses.
  • You also ensure that you have the latest Version of "Microsoft .NET Framework" feature. In order to play League of Legends easily, you need at least Microsoft . NET Framework 3.5. Older versions result in the Launcher crashing without warning.
  • In a few cases, existing files or folders can be on your Computer for this Problem. Some of these files you should remove or update.

LoL: an Active Internet connection and server status

In a first step, make sure that you have an active Internet connection. In all compatible Windows operating versions you usually check under "control panel" and "network connections", if an active LAN connection. Furthermore, it is important that the Server of League of Legends online. If the Server of your Region are online or offline, you can recognize the top right of the Launcher, depending on the server status at the comment "Online" or "Offline".
  • The LoL-Server your Region should be actually offline, there is still a possibility as you play League of Legends online. In the practice tip "LoL-Server-down - what to do?" we will explain how you can outsmart the Offline mode.
Lolserver Status: "Online"

League of Legends: Current Software use

League of Legends starts smoothly and works, it is important that the necessary programs are up to date. A lot of Patches to build on new versions of the programs to ensure that League of Legends runs with no problems. So it is important that you have installed all available Windows Updates and the latest Version of Microsoft .NET Framework, DirectX 9 as well as Adobe Flash Player and Adobe Air installed on your Computer have.
  • If you do not have prohibited the automatic Updates of the respective programs, update the application automatically. Check in each case whether or not you have installed the current version of the program on the hard disk. The program version of each of these applications, take a look at the Windows "set program access and defaults".

The current Launcher to use, and defective files delete

In rare cases, the League-of-crashing Legends Launcher may also with you, as soon as you press Start, the orange colored button. Either defective files and folders, or an outdated Launcher can be responsible.
  • In both cases, you solve the Problem by League of Legends to re-install it on your Computer. On the other hand, it may be enough, if in the League-of-Legends-folder "LegendsRADSprojectslol_launcher" the files "release manifest", "S_OK" as well as the content from the sub-folders "downloads", "solutions" and "projects" delete.
  • In addition, remove in the League-of-Legends-directory of the folder "deploy" in the folder "lib", "META-INF" and "mod" and the files "lolclient.exe", lolclient.swf" and "locale.properties".
  • The League-of-Legends-Launcher updated usually once you run the game. Should this not be the case, uninstall League of Legends and download it again from the official website down.
Current LoL-Launcher
The best Android Apps for League of Legends we present to you in the next practical tip before.

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