Yet another fix for "Unspecified error has occurred. Please check the logs for more information."

I have found a lot of fixes for this but this is what worked for me on 7.4 patch. So whenever i opened my client the error would pop up and in the folder Riot games > league of legends a file called "lockin" or something like that would appear i just opened it with notepad and then deleted it and then the client started updating. I hope this helps anyone and sorry for my bad english.