Rewnewing to longer commitment mid contract

Presale question here - If I opt for a lower risk 6 month contract to test and iron out any issues, will it be possible to upgrade to a 2 year contract and get the better pricing mid contract?

Hey there,
If I opt for a lower risk 6 month contract to test and iron out any issues, will it be possible to upgrade to a 2 year contract and get the better pricing mid contract?

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