It was due to IE Document-mode version too low. Press 'F12' and using higher version( My case, above version 9 is OK)

<meta http-equiv="X-UA-Compatible" content="IE=edge">

Renamed nuget package to "GleamTech.FileUltimate".From now on, same package names will be used for both get.gleamtech.com feed and nuget.org feed (no .NuGetOrg suffix).Please uninstall all GleamTech packages with old names and install the ones with the new names.In Visual Studio: Go to Tools -> NuGet Package Manager -> Package Manager Console and run these commands one by one in order:

Uninstall-Package FileUltimate -RemoveDependencies
Uninstall-Package FileUltimate.NuGetOrg -RemoveDependencies
Install-Package GleamTech.FileUltimate

If you are using direct DLL references, note that the dependency assembly "GleamTech.Core" is renamed to "GleamTech.Common".So in this case, first clean your project, remove references to old assembly, add references to new assembly and build your project.

The other DLLs in the same folder, i.e. GleamTech.ImageUltimate.dll, GleamTech.VideoUltimate.dll and GleamTech.DocumentUltimate.dll are assemblies that FileUltimate depends on for some of the features. They are separate assemblies as they are also standalone products with the same names. MSbuild or Visual Studio will automatically copy these 3 DLLs along with the main referenced assembly GleamTech.FileUltimate.dll to your bin folder during build so they don't need to be referenced directly (unless you are using these products separately in the same project and you have a license for them). Note that even without these 3 DLLs, FileUltimate will work but it will just turn off the corresponding features such as generating image or video thumbnails or the document viewer. So with this modular approach, you can opt-out of the features you do not need by excluding the corresponding DLL, i.e. MSBuild or Visual Studio would automatically copy a dependency only if that DLL is found in the same folder as the main referenced DLL so you can simply delete a DLL in the extracted folder to opt-out.

<%@ Page Title="" Language="vb" AutoEventWireup="false" MasterPageFile="~/Site.Master"
    CodeBehind="DownloadOfficialAnnouncement.aspx.vb" Inherits="CBDesign.DownloadOfficialAnnouncement" %>

<%@ Register TagPrefix="GleamTech" Namespace="GleamTech.FileUltimate" Assembly="GleamTech.FileUltimate" %>
<%@ Register TagPrefix="GleamTech" Assembly="GleamTech.FileUltimate" Namespace="GleamTech.FileUltimate.AspNet.WebForms" %>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
   
    <br />
    <GleamTech:FileManagerControl ID="fileManager" runat="server" SortRootFolders="True"
        Width="1307px" />
</asp:Content>