how to fix 'failed to start launcher:invalid argument' ?

[Mr. Android]

Teddun Download MW3 from steam, don't use Tekno, it's an older version of MW3 which won't work. We use the latest version from Steam. https://forum.plutonium.pw/topic/448/how-to-download-the-iw5-base-game/

[Mr. Android]

Eldor Anything else to add?

[Miller]

Mr. Android did not help

[Nikosned]

I have the same problem. Already have downloaded mw3 on steam, but it shows me the same error, anything else that I can do?

[Mr. Android]

Are you guys running Windows 7?

[Nikosned]

Mr. Android i am running windows 8

[Teddun]

Mr. Android not worked

[Miller]

Mr. Android yes windows 7

[Teddun]

Mr. Android ye win 7

[Dark Prince]

Mr. Android Yes, win 7

[Mr. Android]

We don't support Windows 7, it's reached End Of Life and is a security risk. We suggest upgrading to Windows 10. If you have Windows 10, create a separate support thread so we can easily provide support.