So 262-310 are apparently added to the original game via an EX Scene patch. However, the patch is distributed on Yaseuma Lo-Ru's website (http://ec015.just-size.net/~ylr-foxbox/puroduct/16cccBE/ex.html) in a passworded archive that you have to send a support ticket to decrypt.
Is it a common password for both CCCBlackEdition.zip (disc version) and CCCDLEX.zip (web storefront version)? I'm not a fan of the notice that overseas queries may take a month or more to be answered and that proof of purchase has to be sent to a separate Yahoo address, doubly so since DLsite doesn't organize purchase histories by a cogent transaction receipt.