I'm trying to find out which version of the Sen2Cor processor was used by the ESA to process a Sentinel L2A product for a specific date. The latest version is Sen2Cor v2.8 which was published this year. However, for data of the last two years the ESA had to use a different version. I can't find any information about the used Sen2Cor in the metadata when I am download L2A products via the Copernicus Open Access Hub. This information would be necessary to decide whether to process a Sentinel L1C product with the new Sen2Cor processor or not.