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Free upgrade 3cx Phone System 12 to 3cx 15.5

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unkindlysiy

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Nov 6, 2014
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Good day.
We try use free upgrade from upgrade 3cx Phone System 12 to 3cx 15.5.
Im first make backup, After i install 12.5 and restore backup. When i try backup from 12.5 to 3cx phone system 14 i can activate this, because i see error that this key for previous version and cant be used for this version. Itry upgrdae from backup 14 tho 15.5 but too cant activate.
Who have some idia?
 
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