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I suggest you upgrade your Pligg incrementally as chuckroast replied on one of the threads here. So if you have 9.1, upgrade first to 9.2 to 9.3 to 9.5 to 9.5 to 9.5.1 ....whatever_previous_versions........ until you finally reach 9.9.0
The Pligg version can be seen on Admin under Statistics.
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