I have downloaded the sqlnexus.2.5.0.3 .zip file. I had extracted all the files into a directory and clicked on SQLnexus.exe file. This action ended up in the following error.
 
PLATFORM VERSION INFO

Windows             : 6.0.6000.0 (Win32NT)
Common Language Runtime     : 2.0.50727.1378
System.Deployment.dll       : 2.0.50727.1378 (REDBITSB2.050727-1300)
mscorwks.dll            : 2.0.50727.1378 (REDBITSB2.050727-1300)
dfdll.dll           : 2.0.50727.1378 (REDBITSB2.050727-1300)
dfshim.dll          : 2.0.50727.1378 (REDBITSB2.050727-1300)

 
SOURCES

Deployment url          : file:///C:/Users/daneshb/Desktop/Perfengicourese/sqlnexus.2.5.0.3/sqlnexus.application

 
ERROR SUMMARY

Below is a summary of the errors, details of these errors are listed later in the log.
* Activation of C:\Users\daneshb\Desktop\Perfengicourese\sqlnexus.2.5.0.3\sqlnexus.application resulted in exception. Following failure messages were detected:
    + Exception reading manifest from file:///C:/Users/daneshb/Desktop/Perfengicourese/sqlnexus.2.5.0.3/sqlnexus.application: the manifest may not be valid or the file could not be opened.
    + Manifest XML signature is not valid.
    + No signature was present in the subject.

 
 
COMPONENT STORE TRANSACTION FAILURE SUMMARY

No transaction error was detected.

 
WARNINGS

There were no warnings during this operation.

 
OPERATION PROGRESS STATUS

* [3/17/2008 4:47:17 PM] : Activation of C:\Users\daneshb\Desktop\Perfengicourese\sqlnexus.2.5.0.3\sqlnexus.application has started.

 
ERROR DETAILS

Following errors were detected during this operation.
* [3/17/2008 4:47:17 PM] System.Deployment.Application.InvalidDeploymentException (ManifestParse)
    - Exception reading manifest from file:///C:/Users/daneshb/Desktop/Perfengicourese/sqlnexus.2.5.0.3/sqlnexus.application: the manifest may not be valid or the file could not be opened.
    - Source: System.Deployment
    - Stack trace:
        at System.Deployment.Application.ManifestReader.FromDocument(String localPath, ManifestType manifestType, Uri sourceUri)
        at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestDirectBypass(SubscriptionStore subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState, IDownloadNotification notification, DownloadOptions options, ServerInformation& serverInformation)
        at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestBypass(SubscriptionStore subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState, IDownloadNotification notification, DownloadOptions options)
        at System.Deployment.Application.ApplicationActivator.PerformDeploymentActivation(Uri activationUri, Boolean isShortcut)
        at System.Deployment.Application.ApplicationActivator.ActivateDeploymentWorker(Object state)
    --- Inner Exception ---
    System.Deployment.Application.InvalidDeploymentException (SignatureValidation)
    - Manifest XML signature is not valid.
    - Source: System.Deployment
    - Stack trace:
        at System.Deployment.Application.Manifest.AssemblyManifest.ValidateSignature(Stream s)
        at System.Deployment.Application.ManifestReader.FromDocument(String localPath, ManifestType manifestType, Uri sourceUri)
    --- Inner Exception ---
    System.Security.Cryptography.CryptographicException
    - No signature was present in the subject.

 

    - Source: System.Deployment
    - Stack trace:
        at System.Deployment.Internal.CodeSigning.SignedCmiManifest.Verify(CmiManifestVerifyFlags verifyFlags)
        at System.Deployment.Application.Manifest.AssemblyManifest.ValidateSignature(Stream s)

 
COMPONENT STORE TRANSACTION DETAILS

No transaction information is available.