You need Lightroom 6.5.1 or later to read these RAW files. FREE Alternative: use the Adobe DNG Converter to convert the RAWs to DNG, then import the DNGs into Lightroom 5.7.1.
Lightroom 6 does not require internet access other than one time when you apply the serial number.
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If I get wifi, it is usually satellite based and cannot handle photo transfers.
The "Creative Cloud" name is misleading, and has created a lot of confusion.
Using the CC version of Lightroom does not involve transferring photos to the cloud.
The photos (and the program itself) will, like with Lightroom 5 or 6, be on your local computer.