What you call the ¡®¡®old¡¯¡¯ Excel API (ie using the ActiveX component and VBA, rather than DDE or RTD) is still very much in play and is included in every API version.
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So it¡¯s not clear to me what you¡¯re asking for, or why. I do have some (but by no means all) older versions, but I think you¡¯d probably do best to install the current stable API which is 10.19.