Just bought the Canon EOS M3 but cant import the CR2 files direct to LR 5.7. I can import them through windows and open them in CS6. Does this mean I HAVE TO change to CC in order to still use LR with this camera?
Support for this new Canon camera model was introduced with LR 6/ CC. You have the following options,
a. Upgrade to LR 6/ CC or
b. Use the latest free Adobe DNG Converter to convert your raw files to DNG and then you can work with the dng files in LR 5.7. (since there is a new version release for Lightroom there will be no further updates for LR 5.
The reason that they open in PS CS6 is because the latest ACR Plugin 9.0 has support.