nopcommerce version 3.0 nosource code installation

After extracting and uploading files when I browse the website on IE
I get error

Server Error in '/' Application.
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Configuration Error
Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: The 'targetFramework' attribute in the <compilation> element of the Web.config file is used only to target version 4.0 and later of the .NET Framework (for example, '<compilation targetFramework="4.0">'). The 'targetFramework' attribute currently references a version that is later than the installed version of the .NET Framework. Specify a valid target version of the .NET Framework, or install the required version of the .NET Framework.

Source Error:


Line 40:     </customErrors>
Line 41:     <trace enabled="false" localOnly="true" />
Line 42:     <compilation targetFramework="4.5">
Line 43:       <assemblies>
Line 44:         <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856A" />


Source File: C:\inetpub\wwwroot\nopCommerce\web.config    Line: 42


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Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272

You need to install .NET 4.5, findi it here http://www.microsoft.com/en-us/download/details.aspx?id=30653

thank for the fix I am into admin page setup and I get an error when run the wizard
Does this error message means to grant modify access to user "IIS_IUSRS" to specified folder

Error message

The 'IIS APPPOOL\ASP.NET v4.0' account is not granted with Modify permission on folder 'C:\inetpub\wwwroot\nopCommerce\App_Data'. Please configure these permissions.
The 'IIS APPPOOL\ASP.NET v4.0' account is not granted with Modify permission on folder 'C:\inetpub\wwwroot\nopCommerce\bin'. Please configure these permissions.
The 'IIS APPPOOL\ASP.NET v4.0' account is not granted with Modify permission on folder 'C:\inetpub\wwwroot\nopCommerce\content'. Please configure these permissions.
The 'IIS APPPOOL\ASP.NET v4.0' account is not granted with Modify permission on folder 'C:\inetpub\wwwroot\nopCommerce\content\images'. Please configure these permissions.
The 'IIS APPPOOL\ASP.NET v4.0' account is not granted with Modify permission on folder 'C:\inetpub\wwwroot\nopCommerce\content\images\thumbs'. Please configure these permissions.
The 'IIS APPPOOL\ASP.NET v4.0' account is not granted with Modify permission on folder 'C:\inetpub\wwwroot\nopCommerce\content\images\uploaded'. Please configure these permissions.
The 'IIS APPPOOL\ASP.NET v4.0' account is not granted with Modify permission on folder 'C:\inetpub\wwwroot\nopCommerce\content\files\exportimport'. Please configure these permissions.
The 'IIS APPPOOL\ASP.NET v4.0' account is not granted with Modify permission on folder 'C:\inetpub\wwwroot\nopCommerce\plugins'. Please configure these permissions.
The 'IIS APPPOOL\ASP.NET v4.0' account is not granted with Modify permission on folder 'C:\inetpub\wwwroot\nopCommerce\plugins\bin'. Please configure these permissions.
The 'IIS APPPOOL\ASP.NET v4.0' account is not granted with Modify permission on file 'C:\inetpub\wwwroot\nopCommerce\Global.asax'. Please configure these permissions.
The 'IIS APPPOOL\ASP.NET v4.0' account is not granted with Modify permission on file 'C:\inetpub\wwwroot\nopCommerce\web.config'. Please configure these permissions.

no, you have to give "IIS APPPOOL\ASP.NET v4.0" modify rights. Basically, right click the folder, select properties, then open the security tab and click on "edit", in the window that pops up, click "Add" in the window that pops up enter "IIS APPPOOL\ASP.NET v4.0" and click "check names", click OK to close and now you can select "modify" rights.

Hi thanks for reply
There is no such user both locally and AD "IIS APPPOOL\ASP.NET v4.0"
for IIS there are only two users

IIS-IUSRS
IUSRS

in IIS Manager, select your site in the tree in the left pane, then on the right pane, click on "Advanced Settings", this should pop up a window, look at the value for property "Application Pool", this is the identity that should have modify rights as I decribed above (eg. right click folder, propereties, lookup the name etc). For a default installation this is usually "DefaultAppPool".

The value for "Application pool" I have is "ASP.NET v4.0"
I still cannot find it to assign modify permissions
I try the "default pool" and "Classic" and non of them are there
Can I create this user manually and add

I assign modify access to "local\user IIS_IUSRS"
Now it is working thank you for help