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DISK SPACE WARNING:

Note that RawTherapee uses version-dependent cache and configuration
directories.  Please be advised that cache directories can grow large,
so be sure to check all users' $HOME/.cache/RawTherapee* and have them
remove older cache directories.

Also, after configurations have been moved to the new version's
directory, older $HOME/.config/RawTherapee* directories may be removed.
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