I'll join this party - exact same situation happening to me.  In case it helps, I'm including the Exception Text below:

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.TypeInitializationException: The type initializer for 'EverSyncIE.Local.Backup' threw an exception. ---> System.Exception: Invalid record format
   at EverSyncIE.Local.favorite.FavoriteHelper.MenuOrderRecord.Deserialize(Stream stream)
   at EverSyncIE.Local.favorite.FavoriteHelper.LoadOrderFromRegistry(RegistryKey registryKey)
   at EverSyncIE.Local.supply.Utilities.GetBookmarksOrderTable(String regPath)
   at EverSyncIE.Local.LocalBookmarks.GetList(Boolean overwriteId)
   at EverSyncIE.Local.Backup.SaveBackup()
   at EverSyncIE.Local.Backup..cctor()
   --- End of inner exception stack trace ---
   at EverSyncIE.Local.Backup.SaveBackup()
   at EverSyncIE.SettingsPage.SaveBackupIfAllow(Boolean force)
   at EverSyncIE.SettingsPage.downloadButton_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Loaded Assemblies **************
mscorlib
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.2633.0 built by: NET471REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/mscorlib.dll
----------------------------------------
EverSyncIE
    Assembly Version: 1.0.0.68
    Win32 Version: 1.0.0.68
    CodeBase: file:///C:/Users/Chris.L/AppData/Local/Apps/2.0/RXQ0L7N9.QR7/78Q12NOV.8HD/ever..tion_03b4ed52e034855b_0001.0000_54d3ef27c86451dc/EverSyncIE.exe
----------------------------------------
System
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.2556.0 built by: NET471REL1
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Windows.Forms
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.2556.0 built by: NET471REL1
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System.Drawing
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.2556.0 built by: NET471REL1
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Core
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.2633.0 built by: NET471REL1LAST_C
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Management
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.2556.0 built by: NET471REL1
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Management/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Management.dll
----------------------------------------
System.Configuration
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.2556.0 built by: NET471REL1
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Xml
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.2612.0 built by: NET471REL1LAST_B
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
Microsoft.mshtml
    Assembly Version: 7.0.3300.0
    Win32 Version: 7.0.3300.0
    CodeBase: file:///C:/WINDOWS/assembly/GAC/Microsoft.mshtml/7.0.3300.0__b03f5f7f11d50a3a/Microsoft.mshtml.dll
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
    <system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.