Aspen doesn't have constants for the 3 constant version of the Antoine equation. The closest Aspen comes is a form called the extended Antoine equation, which has 6 coefficients if memory serves. You'd be much better off going to a handbook like Lange's Handbook of Chemistry, which has a rather extensive listing of Antoine coefficients.

Or you could try here

https://app.knovel.com/web/toc.v/cid:kpYHACVPEH

If you add the Aspen Properties add-in to Excel, you can call its vapor pressure function for various temperatures and then regress the Antoine coefficients yourself...seems like a lot of work when other sources are easily available.

You can find Antoine coefficients for many pure components at different temperatures in the TRC THERMODYNAMICAL RESEARCH CENTER database

Parameters Ci for the Extended Antoine Equations can be found as PLXANT-1

You can transform to the Basic Antoine Equation by the following formulae:

C1 = A Ln(10)

C2 = -B Ln(10)

C3 = C