LabVIEW is the only 2015 language that supports running 2015 code on the older 4-slot cRIOs.
To use the 2015 LabVIEW software on a cRIO, the cRIO must be reformatted to v54 or later, using a new FRC CRIO Imaging Tool found at C://Project Files/National Instruments/LabVIEW 2014/project/CRIO Tool
We can also keep the existing environments we used last year around just to program the cRIOs. Last season's LabVIEW and Java don't expire, but c++ does so C++ will need a new toolchain to continue supporting the older cRIOs.
So
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Option 1: LabVIEW & Java Can Use Existing Setups to program cRIOs
Java teams can continue using Netbeans with the old libraries
LabVIEW license from last season never expires (just other years) - caution: don't install LV FRC 2015 on the same machine with last year's LabVIEW, because some conflicts with common names may result.
Option 2: C++ WindRiver Expires, so Use a Different Setup
C++ teams can use the project located on FIRSTForge here:
http://firstforge.wpi.edu/sf/projects/c--11_toochain
Option 3: LabVIEW-Only New Software Will Work on cRIO II
Backward compatibility for LabVIEW w/ 4-slot cRIO only