Can't open SDL Studio 2015 after update SR3

After installing the new SR3 update and after following the installation steps, when I try to open SDL Trados Studio SR3, it loads first some Stuff and then I get this error message:
Failed to initialize view 'QualitivityViewController'

Any idea on how this can be fixed?
I really need to keep working. Sadly I did the big mistake of not doing a backup or img before updating...

<SDLErrorDetails time="21.03.2017 13:55:07">
  <ErrorMessage>Failed to initialize view 'QualitivityViewController'.</ErrorMessage>
  <Exception>
    <Type>Sdl.Desktop.Platform.StudioException, Sdl.Desktop.Platform, Version=4.0.0.0, Culture=neutral, PublicKeyToken=c28cdb26c445c888</Type>
    <HelpLink />
    <Source>Sdl.Desktop.Platform</Source>
    <HResult>-2146233088</HResult>
    <StackTrace><![CDATA[   at Sdl.Desktop.Platform.Implementation.StudioWindow.EnsureViewSite(IViewReference viewReference)
   at Sdl.Desktop.Platform.Implementation.StudioWindow.GetController(String viewId)
   at Sdl.Desktop.IntegrationApi.Internal.ExtensionBuilders.AbstractViewControllerBuilder.Build(IExtension extension, Object defaultInstance, ExtensionArguments arguments)
   at Sdl.Core.PluginFramework.Integration.ExtensionsRepository.AddExtension[TResult](IExtension extension, ExtensionArguments arguments, Func`4 instanceCreator)
   at Sdl.Core.PluginFramework.Integration.ExtensionBuilderFactory.Build[TResult](IExtension extension, ExtensionArguments arguments, Boolean useCache)
   at Sdl.Core.PluginFramework.Integration.ExtensionBuilderFactory.<>c__DisplayClass1`2.<Build>b__0(IExtension extension)
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Sdl.Core.PluginFramework.Integration.ExtensionBuilderFactory.Build[TAttribute,TResult](ExtensionArguments arguments, Boolean useCache)
   at Sdl.Core.PluginFramework.Integration.ExtensionsFactory.Create[TAttribute,TResult](ExtensionArguments arguments, Boolean useCache)
   at Sdl.Desktop.Platform.Implementation.StudioWindow.Init()
   at Sdl.Desktop.Platform.Implementation.Studio.CreateWindowInternal(Boolean setActive)
   at Sdl.Desktop.Platform.Implementation.Studio.Run()
   at Sdl.TranslationStudio.Application.Launcher.RunApplication()]]></StackTrace>
    <InnerException>
      <Type>System.IO.FileLoadException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
      <FileName>System.Data.SQLite, Version=1.0.60.0, Culture=neutral, PublicKeyToken=db937bc2d44ff139</FileName>
      <FusionLog>WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].
</FusionLog>
      <HelpLink />
      <Source>Qualitivity.QY</Source>
      <HResult>-2146234304</HResult>
      <StackTrace><![CDATA[   at QY.Database.Query.InitializeSettings(String database_path, List`1 viewSettings, List`1 backupSettings, List`1 generalSettings, List`1 trackerSettings)
   at Studio.Time.Tracker.QualitivityViewController.Initialize(IViewContext context)
   at Sdl.Desktop.IntegrationApi.AbstractViewController.Sdl.Desktop.IntegrationApi.Internal.IViewController.Initialize(IViewContext context)
   at Sdl.Desktop.IntegrationApi.Internal.Adaptors.InternalDockingViewAdaptor.OnInit(IViewSite site, ISettingsGroup settings)
   at Sdl.Desktop.Platform.AbstractView.Init(IViewSite site, ISettingsGroup settings)
   at Sdl.Desktop.Platform.Implementation.StudioWindow.EnsureViewSite(IViewReference viewReference)]]></StackTrace>
    </InnerException>
  </Exception>
  <Environment>
    <ProductName>SDL Trados Studio</ProductName>
    <ProductVersion>12.0.0.0</ProductVersion>
    <EntryAssemblyFileVersion>12.3.5262.0</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 10 Pro</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>1033</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>Hans-PC\Hans</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>HANS-PC</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>8078120 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>