cannot install v4

hi
i cannot install the version 4.0 and every time it shows a 500 internal server error.

thank u
i didn't expect it.

Please set soutLogEnabled to "true" in your web.config file. Then error will be logged into \log directory

Its because you didn't noticed the system requirements on http://docs.nopcommerce.com/pages/viewpage.action?pageId=10256757
you should download and install https://www.microsoft.com/net/download/thank-you/dotnet-runtime-2.0.4-windows-windows-server-hosting-installer

It will help

Also check file permissions read/write for IIS_User