File duplicity using download_libs.sh script

I just ran into this issue and I’m not sure how it happened. I’ll leave this here in case someone’s googling. The download_libs.sh script created duplicated files with a number appended to them. So I had several files duplicated:

openFrameworksLibs_master_vs2015_32.zip
openFrameworksLibs_master_vs2015_32.zip.1
openFrameworksLibs_master_vs2015_32.zip.2
...

This caused the script to fail with:

Uncompressing libraries vs2015 from openFrameworksLibs_master_vs2015_32.zip
[../scripts/dev/openFrameworksLibs_master_vs2015_32.zip]
  End-of-central-directory signature not found.  Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive.  In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.
unzip:  cannot find zipfile directory in one of ../scripts/dev/openFrameworksLibs_master_vs2015_32.zip or
        ../scripts/dev/openFrameworksLibs_master_vs2015_32.zip.zip, and cannot find ../scripts/dev/openFrameworksLibs_master_vs2015_32.zip.ZIP, period.
Error on or near line 176; exiting with status 1

Deleting all repeated files solves the problem.