Ok thanks a lot. But I have bought the new version of the ecoinvent database, and then now there is a zip archive on the openlca official website about the EN15804 methodology, so I am currently trying to download the free EN15804 methodology (no longer have the budget to buy any other databases), and import it into the Ecoinvent database in openlca. I would like to ask you if I can fulfil the EPD requirements by doing this?