/opt/pakfire/lib/functions.pl
was pretty helpful and decryption is easy:
Download latest cups 2.4.1 release 32 and use gpg to decrypt the file:
gpg -d cups-2.4.1-32.ipfire > cups-2.4.1-32.tar
extract the archive:
tar xaf cups-2.4.1-32.tar
copy the files to:
/opt/pakfire/tmp
… run the update.sh or install.sh script , empty the folder und your’re done 