I think 2.1. is fairly old, with a slightly newer version 2.4.2 I get:
fastq-dump.2.4.2 err: error unexpected while resolving tree within virtual file system module - failed to resolve accession 'SRR2016445' - Obsolete software. See https://github.com/ncbi/sra-tools/wiki ( 406 )
Please note that most SRA files are not self contained, they depend on a reference sequence which is a separate download. Thus it is not enough to download the SRA file with wget. 'fastq-dump' will try to download the reference sequence behind the scenes before it extracts any reads. The reference sequence for SRR2016445 is https://www.ncbi.nlm.nih.gov/nuccore/149361431.