Fairphone 2 Open OS is available

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Can't install Fairphone open OS after updating to 1.5.1 OS

Hi all, I just updated my fairphone 2 to 1.5.1 standard OS. My next step was to install the Open OS. However, I got the following error: “Can’t install this package (Tue Jun 14 15:55:46 CEST 2016) over newer build (Wed Jun 29 1:54:03 SGT 2016). E:Error in /cache/fp_update.zip_ (Status 7)” Do I simply have to wait until the latest open OS is released and if so, how long will that take? In the mean time I suppose I could root OS 1.5.1. Thanks in advance