pip offline install fails at 'collecting pbr'

[Bruce Lamond]

I downloaded python-jenkins-1.4.0 and dependencies using pip download python-jenkins.
I then go offline and try to install with python -m pip.py install path/to/python_jenkins...whl

It fails with:
Processing c:\sw\svn\common\ext\python\wheels\python-jenkins\python_jenkins-1.4.0-py2.py3-none-any.whl
Requirement already satisfied: requests in c:\sw\apps\continuum\miniconda2\lib\site-packages (from python-jenkins==1.4.0)
Requirement already satisfied: six>=1.3.0 in c:\sw\apps\continuum\miniconda2\lib\site-packages (from python-jenkins==1.4.0)
Collecting pbr>=0.8.2 (from python-jenkins==1.4.0)
  Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.requests.packages.urllib3.conne
ction.VerifiedHTTPSConnection object at 0x0000000003E3F1D0>, 'Connection to pypi.python.org timed out. (connect timeout=15)')': /simple/pbr/
  Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.requests.packages.urllib3.conne
ction.VerifiedHTTPSConnection object at 0x0000000003E3F278>, 'Connection to pypi.python.org timed out. (connect timeout=15)')': /simple/pbr/
  Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.requests.packages.urllib3.conne
ction.VerifiedHTTPSConnection object at 0x0000000003E3F2B0>, 'Connection to pypi.python.org timed out. (connect timeout=15)')': /simple/pbr/
  Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.requests.packages.urllib3.conne
ction.VerifiedHTTPSConnection object at 0x0000000003E3F208>, 'Connection to pypi.python.org timed out. (connect timeout=15)')': /simple/pbr/
  Retrying (Retry(total=0, connect=None, read=None, redirect=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.requests.packages.urllib3.conne
ction.VerifiedHTTPSConnection object at 0x0000000003E4DD30>, 'Connection to pypi.python.org timed out. (connect timeout=15)')': /simple/pbr/
  Could not find a version that satisfies the requirement pbr>=0.8.2 (from python-jenkins==1.4.0) (from versions: )
No matching distribution found for pbr>=0.8.2 (from python-jenkins==1.4.0)

Python version:

Python 2.7.13 |Continuum Analytics, Inc.| (default, May 11 2017, 13:17:26) [MSC v.1500 64 bit (AMD64)] on win32
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python-jenkins wheel directory contains:

C:\sw\svn\common\ext\python\wheels\python-jenkins>dir
 Volume in drive C is SYSTEM
 Volume Serial Number is F0E2-B9D1

 Directory of C:\sw\common\ext\python\wheels\python-jenkins

01/15/2019 07:40 PM <DIR> .
01/15/2019 07:40 PM <DIR> ..
11/27/2018 07:43 PM 146,308 certifi-2018.10.15-py2.py3-none-any.whl
11/27/2018 07:43 PM 8,429 multi_key_dict-2.0.3.tar.gz
11/27/2018 07:43 PM 106,727 pbr-5.1.1-py2.py3-none-any.whl
11/27/2018 07:43 PM 26,886 python_jenkins-1.4.0-py2.py3-none-any.whl
11/27/2018 07:43 PM 57,987 requests-2.20.1-py2.py3-none-any.whl
11/27/2018 07:43 PM 10,702 six-1.11.0-py2.py3-none-any.whl
11/27/2018 07:43 PM 118,086 urllib3-1.24.1-py2.py3-none-any.whl
               7 File(s) 475,125 bytes
               2 Dir(s) 132,008,984,576 bytes free

pip version:

>pip --version
pip 18.1 from c:\sw\apps\continuum\miniconda2\lib\site-packages\pip (python 2.7)

As soon as I add my proxy server address back in, pip downloads and installs pbr then installs the other packages from the local directory.

Thanks