Issue: The .APPLICATION file can not be downloaded - VisualSP Online site collection installer
Edge Extension\Safari Extension
Cause: Windows bug exposed when you are using a proxy server and you bypass the proxy for local addresses.
Solution: Install the HotFix and/or apply the workaround presented by Microsoft here: https://support.microsoft.com/en-us/help/952324/fix-you-cannot-download-the--application-file-when-you-deploy-an-appli
Diagnostic steps: When you click the link to download VisualSPOnlineHelpApp.SiteCollectionConfigWizard.application , the file doesn’t download, but you are presented with a screen showing an OneClick installation error log. The log information matches that at the above Solution link.
The inability to download the .APPLICATION file when deploying the VisualSP Online site collection installer can be attributed to a Windows bug exacerbated by proxy server configurations. By installing the recommended HotFix and applying the provided workaround by Microsoft, users can overcome this obstacle and proceed with the installation process seamlessly. Additionally, diagnostic steps have been outlined to assist users in identifying and addressing this issue effectively. We hope this guide has provided clarity and guidance, ensuring a smooth installation experience for VisualSP Online users. Should you require further assistance or encounter any challenges, please don't hesitate to reach out to our support team for prompt resolution.