Launcher deleted and cannot be reinstalled

Hi guys,

Today the launcher got deleted from the folder and the shortcut isn't working anymore.
After trying to reinstall the client I get the error message visible on the screenshot below.

I wonder why it did not encounter any issue after all the passed updates. I'm using Windows 10 and I followed StephanM's thread but I can't add the folder to the Windows Defender's exceptions list.
The error occurs as soon as the client has started to install so maybe it's not caused by the firewall/antivirus ?

Thank you

Attachment 17067

Try the obvious, turn off all antivirus/firewall and try then, also run it as administrator.

Try to install game in another folder..