Just FYI, I had an error trying to import in Kleopatra a crl from the file attached. Also fails importing in dirmgr using --import-crl command. Importing in windows certmgr is ok and also using XCA program.
Unfortunately S/MIME is currently hard to setup. (More than necessary and more than OpenPGP.)
For a crl import to work, you’ll need to have the needed certficates imported already.
Here is my attempt on a GNU system with dirmngr (GnuPG) 2.2.6:
dirmngr -v --load-crl ec-ciutadania.crl
[…]
dirmngr[3573.0]: update times of this CRL: this=20180419T105056 next=20180426T105056
dirmngr[3573.0]: locating CRL issuer certificate by authorityKeyIdentifier
dirmngr[3573.0]: error fetching certificate by subject: Not implemented
dirmngr[3573.0]: CRL issuer certificate {0B68593E87C8A3151AE04082225F9F1DB2C53715} not found
dirmngr[3573.0]: crl_parse_insert failed: Missing certificate