Edit/Mass Edit Powerpoint linked file addresses

Okay so I found something that can get me partially there on another forum after I posted this. Although I've worked with powerpoint a decent amount I'm not quite to the level of writing my own macros yet. This is the macro I found. 

Sub EditLink()
' Edit links of some types
' Little error checking.  It works or not.  No harm if not.

    Dim sLinkSource As String
    Dim sOriginalLinkSource As String

    If ActiveWindow.Selection.ShapeRange.Count <> 1 Then
      MsgBox ("Please select one and only one shape, then try again.")
      Exit Sub
    End If

    With ActiveWindow.Selection.ShapeRange(1)
        'MsgBox .LinkFormat.SourceFullName
        sOriginalLinkSource = .LinkFormat.SourceFullName
        sLinkSource = InputBox("Edit the link", "Link Editor", sOriginalLinkSource)

        If sLinkSource = sOriginalLinkSource Then
            ' nothing changed; our work on this planet is done
            Exit Sub
        End If
        If sLinkSource = "" Then
            ' The user canceled; quit:
            Exit Sub
        End If

        ' Get the filename portion of the link in case it's a link to a range
        Debug.Print Mid$(sLinkSource, 1, InStr(sLinkSource, ".") + 3)

        ' Is it a valid filename?  Is the file where it belongs?
        ' Test against the filename portion of the link in case the link includes
        ' range information
        If Dir$(Mid$(sLinkSource, 1, InStr(sLinkSource, ".") + 3)) <> "" Then
            .LinkFormat.SourceFullName = sLinkSource
            .LinkFormat.Update
        Else
            MsgBox "Can't find " & sLinkSource
        End If

    End With

End Sub

The good thing is for updating singular photos for my tables this will work perfectly should I ever need to update something in the future. For just a few items it's perfect. However efficiency wise it leaves much to be desired. 

In addition I also found a macro on this page here: 

https://www.rdpslides.com/pptfaq/FAQ00759_Search_-_Replace_to_change_OLE_link_paths.htm

However when I tried to do it, either something I was doing wasn't working, or the thing just flat out doesn't work for what I was wanting to do. 

So my question now is this. Is there anything similar to the first macro that can work and let me mass edit file paths at once? For that matter if we could do a find and replace function on the "Edit Links to Files" table instead of having to change everything one by one, that would work too. For those of you who are much more experienced with powerpoint and macros than I am, what am I missing and how can I get over the finish line? The first macro I know for certain will work but is only good for a single thing at a time. Second one I couldn't get to work at all. Slight progress made.