Possible Fixes & Workarounds:

1. Use a Direct <a> Tag with download Attribute:
   Try replacing the RadButton with a simple <a> tag to check if the issue persists:

   html
   CopyEdit
   <a href="~/assets/someform.docx" download>Download File</a>
   

   If this works, then the issue is likely with the way RadButton renders links.

2. Force File Download via Code-Behind:
   Instead of linking directly to the file, use a handler (ashx file) or serve the file in the code-behind to force a download:

   protected void btnDownload_Click(object sender, EventArgs e)
   {
       string filePath = Server.MapPath("~/assets/someform.docx");
       Response.Clear();
       Response.ContentType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
       Response.AddHeader("Content-Disposition", "attachment; filename=someform.docx");
       Response.WriteFile(filePath);
       Response.End();
   }
   

   Update your RadButton to trigger this method instead.

3. Check Browser Console for Security Blocks:
   Open DevTools (F12) in Chrome/Edge and check for any security errors related to CORS, Content Security Policy (CSP), or mixed content.

4. Ensure Correct Content-Type and Headers:
   If the file is hosted on an external server, ensure it sends the correct Content-Disposition: attachment header.

5. Try Telerik Updates:
   If you're using an older Telerik version, updating to the latest version might fix compatibility issues with Chromium-based browsers.

6. Test in Zoho Developer Environment:
   If you're integrating with Zoho Developer, ensure that the file is accessible within the Zoho app and check if any Zoho security settings are preventing downloads.