You need to install this package separately.
These are the packages required (minimum) for desktop-effects-kde:
compiz-kde compiz-fusion-plugins-main compiz-fusion-plugins-extra
Installing these will also pull in:
compiz-core compiz-plugins compizconfig-backend-kconfig libcompizconfig0
Marking invalid, as the program is not required to download a separate
settings manager. The text for Custom Effects states you can Use
custom settings from another settings manager. The implication is the
user will install a settings manager and manage the effects on his/her
own from outside the
removing all installed compiz- packages does not solve the problem,
clicking on custom effects still won't download compizconfig-settings-
manager package
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Custom effects doesn't download compizconfig-settings-manager
https://bugs.launchpad.net/bugs/207612
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