spark-ec2 init.sh requests .tgz files not available at http://s3.amazonaws.com/spark-related-packages

When I run the spark-ec2 script in a local spark-1.6.3 installation, the error 'ERROR: Unknown Spark version' is generated:

Initializing spark
-2016-11-18 22:33:06- http://s3.amazonaws.com/spark-related-packages/spark-1.6.3-bin-hadoop1.tgz
Resolving s3.amazonaws.com (s3.amazonaws.com)... 52.216.1.3
Connecting to s3.amazonaws.com (s3.amazonaws.com)|52.216.1.3|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2016-11-18 22:33:06 ERROR 404: Not Found.

ERROR: Unknown Spark version
spark/init.sh: line 137: return: -1: invalid option
return: usage: return [n]
Unpacking Spark
tar (child): spark-*.tgz: Cannot open: No such file or directory
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now
rm: cannot remove `spark-*.tgz': No such file or directory
mv: missing destination file operand after `spark'
Try `mv --help' for more information.
[timing] spark init: 00h 00m 00s

I think this happens when init.sh executes these lines:
if [[ "$HADOOP_MAJOR_VERSION" == "1" ]]; then
wget http://s3.amazonaws.com/spark-related-packages/spark-$SPARK_VERSION-bin-hadoop1.tgz
elif [[ "$HADOOP_MAJOR_VERSION" == "2" ]]; then
wget http://s3.amazonaws.com/spark-related-packages/spark-$SPARK_VERSION-bin-cdh4.tgz
else
wget http://s3.amazonaws.com/spark-related-packages/spark-$SPARK_VERSION-bin-hadoop2.4.tgz
fi
if [ $? != 0 ]; then
echo "ERROR: Unknown Spark version"
return -1
fi

spark-1.6.3-bin-hadoop1.tgz does not exist on <http://s3.amazonaws.com/spark-related-packages/>
Similarly, a spark-2.0.1-bin-hadoop1.tgz also does not exist at that location. So with these versions, if in init.sh [ "$HADOOP_MAJOR_VERSION" == "1" ] evaluates to True, spark installation on the EC2 cluster will fail.

Related (perhaps a different bug?) is: I have installed spark-1.6.3-bin-hadoop2.6.tgz, but if the error is generated by init.sh, then it appears that HADOOP_MAJOR_VERSION ==1 is True, otherwise a different spark version would be requested from <http://s3.amazonaws.com/spark-related-packages/>. I am not experienced enough to verify this. My installed hadoop version should be 2.6. Please tell me if this should be a different bug report.