Google nav / SpeechSynthesis Data Installer problem

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Ok, so trying to use google maps free nav.
i used bruts hack of it before the release fine.

I prompts me to install SpeechSynthesis Data Installer, i install,
then it says the voice data failed to install, make sure have 6mb free
on sd card etc.. etc..

Seen couple of comments saying it does this to other desire users. any fixes?

Plus my brut hack has stopped working for the same reason too, although it worked fine before!

Is there a fix for this I to cant install
thanks in advance!