Skin generally take a lot of space in Flash, so it's better to clean a little the Flash first (to remove useless things for example some Wifi driver not used, you find them in /lib/modules/ and below on /net/wireless), and then to install the skin if you have at least 3-4 Mb available.

Or you need to move some of the Flash into an external Flash Memory Dongle, see on the Useful/Tips section the various tips on how to do it and what to do.

TS
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DM8000, DM800se, DM500HD, DM800HD, DM7025, DM7020s, DM7000, DM500s
VU+ Solo, VU+ Uno, VU+ Duo, Kathrein UFS910
Tivusat, TNTSat, Fransat, SSR/TSR, BBC1-2-3/ITV
DE-OpenBlackHole 1.4 image : http://www.openblackhole.com/