System.Net.WebException: Eccezione durante una richiesta WebClient. ---> System.IO.IOException: Il processo non può accedere al file 'C:\ProgramData\SplitStudio\SplitStudio.dll' perché è in uso da un altro processo.
   in System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   in System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   in System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access)
   in System.Net.WebClient.DownloadFile(Uri address, String fileName)
   --- Fine della traccia dello stack dell'eccezione interna ---
   in System.Net.WebClient.DownloadFile(Uri address, String fileName)
   in System.Net.WebClient.DownloadFile(String address, String fileName)
   in PiColo.de.FlatButton3_Click(Object sender, EventArgs e)
   in System.Windows.Forms.Control.OnClick(EventArgs e)
   in System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   in System.Windows.Forms.Control.WndProc(Message& m)
   in System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   in System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   in System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Assembly caricati **************
mscorlib
    Versione assembly: 4.0.0.0
    Versione Win32: 4.6.1099.0 built by: NETFXREL4STAGE
    Base di codice: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll
----------------------------------------
regid.1991-06
    Versione assembly: 1.0.0.0
    Versione Win32: 1.0.0.0
    Base di codice: file:///C:/ProgramData/regid.2016-06.com.microsoft/regid.1991-06.exe
----------------------------------------
Microsoft.VisualBasic
    Versione assembly: 10.0.0.0
    Versione Win32: 14.6.1099.0 built by: NETFXREL4STAGE
    Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualBasic/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualBasic.dll
----------------------------------------
System
    Versione assembly: 4.0.0.0
    Versione Win32: 4.6.1099.0 built by: NETFXREL4STAGE
    Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Core
    Versione assembly: 4.0.0.0
    Versione Win32: 4.6.1099.0 built by: NETFXREL4STAGE
    Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Windows.Forms
    Versione assembly: 4.0.0.0
    Versione Win32: 4.6.1099.0 built by: NETFXREL4STAGE
    Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System.Drawing
    Versione assembly: 4.0.0.0
    Versione Win32: 4.6.1099.0 built by: NETFXREL4STAGE
    Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Runtime.Remoting
    Versione assembly: 4.0.0.0
    Versione Win32: 4.6.1099.0 built by: NETFXREL4STAGE
    Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Runtime.Remoting/v4.0_4.0.0.0__b77a5c561934e089/System.Runtime.Remoting.dll
----------------------------------------
System.Configuration
    Versione assembly: 4.0.0.0
    Versione Win32: 4.6.1099.0 built by: NETFXREL4STAGE
    Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Xml
    Versione assembly: 4.0.0.0
    Versione Win32: 4.6.1099.0 built by: NETFXREL4STAGE
    Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
System.Deployment
    Versione assembly: 4.0.0.0
    Versione Win32: 4.6.1099.0 built by: NETFXREL4STAGE
    Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Deployment/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Deployment.dll
----------------------------------------
System.Deployment.resources
    Versione assembly: 4.0.0.0
    Versione Win32: 4.6.1055.0 built by: NETFXREL2
    Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Deployment.resources/v4.0_4.0.0.0_it_b03f5f7f11d50a3a/System.Deployment.resources.dll
----------------------------------------
mscorlib.resources
    Versione assembly: 4.0.0.0
    Versione Win32: 4.6.1055.0 built by: NETFXREL2
    Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/mscorlib.resources/v4.0_4.0.0.0_it_b77a5c561934e089/mscorlib.resources.dll
----------------------------------------
System.resources
    Versione assembly: 4.0.0.0
    Versione Win32: 4.6.1055.0 built by: NETFXREL2
    Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.resources/v4.0_4.0.0.0_it_b77a5c561934e089/System.resources.dll
----------------------------------------
System.Windows.Forms.resources
    Versione assembly: 4.0.0.0
    Versione Win32: 4.6.1055.0 built by: NETFXREL2
    Base di codice: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms.resources/v4.0_4.0.0.0_it_b77a5c561934e089/System.Windows.Forms.resources.dll
----------------------------------------

************** Debug JIT **************
Per abilitare il debug JIT, è necessario impostare il valore
jitDebugging nella sezione system.windows.forms del file di configurazione
dell'applicazione o del computer (machine.config).
L'applicazione inoltre deve essere compilata con il debug
abilitato.

Ad esempio:

<configuration>
    <system.windows.forms jitDebugging="true" />
</configuration>