Unable to install Python package name with bad characters (spaces)

pip install -v Sphinx-Substitution-Extensions
Created temporary directory: /private/var/folders/b_/l1m2c1r50bz92q5f7khcj96h0000gn/T/pip-ephem-wheel-cache-nizdbrq3
Created temporary directory: /private/var/folders/b_/l1m2c1r50bz92q5f7khcj96h0000gn/T/pip-req-tracker-ef5entm5
Created requirements tracker '/private/var/folders/b_/l1m2c1r50bz92q5f7khcj96h0000gn/T/pip-req-tracker-ef5entm5'
Created temporary directory: /private/var/folders/b_/l1m2c1r50bz92q5f7khcj96h0000gn/T/pip-install-7kpk98jx
Looking in indexes: https://sonatype3/repository/pypi-production/simple
Collecting Sphinx-Substitution-Extensions
  1 location(s) to search for versions of Sphinx-Substitution-Extensions:
  * https://sonatype3/repository/pypi-production/simple/sphinx-substitution-extensions/
  Getting page https://sonatype3/repository/pypi-production/simple/sphinx-substitution-extensions/
  Looking up "https://sonatype3/repository/pypi-production/simple/sphinx-substitution-extensions/" in the cache
  Request header has "max_age" as 0, cache bypassed
  Starting new HTTPS connection (1): sonatype3:443
  https://sonatype3:443 "GET /repository/pypi-production/simple/sphinx-substitution-extensions/ HTTP/1.1" 500 2227
  Incremented Retry for (url='/repository/pypi-production/simple/sphinx-substitution-extensions/'): Retry(total=4, connect=None, read=None, redirect=None, status=None)
  Retry: /repository/pypi-production/simple/sphinx-substitution-extensions/
  https://sonatype3:443 "GET /repository/pypi-production/simple/sphinx-substitution-extensions/ HTTP/1.1" 500 2227
  Incremented Retry for (url='/repository/pypi-production/simple/sphinx-substitution-extensions/'): Retry(total=3, connect=None, read=None, redirect=None, status=None)
  Retry: /repository/pypi-production/simple/sphinx-substitution-extensions/
  https://sonatype3:443 "GET /repository/pypi-production/simple/sphinx-substitution-extensions/ HTTP/1.1" 500 2227
  Incremented Retry for (url='/repository/pypi-production/simple/sphinx-substitution-extensions/'): Retry(total=2, connect=None, read=None, redirect=None, status=None)
  Retry: /repository/pypi-production/simple/sphinx-substitution-extensions/
  https://sonatype3:443 "GET /repository/pypi-production/simple/sphinx-substitution-extensions/ HTTP/1.1" 500 2227
  Incremented Retry for (url='/repository/pypi-production/simple/sphinx-substitution-extensions/'): Retry(total=1, connect=None, read=None, redirect=None, status=None)
  Retry: /repository/pypi-production/simple/sphinx-substitution-extensions/
  https://sonatype3:443 "GET /repository/pypi-production/simple/sphinx-substitution-extensions/ HTTP/1.1" 500 2227
  Incremented Retry for (url='/repository/pypi-production/simple/sphinx-substitution-extensions/'): Retry(total=0, connect=None, read=None, redirect=None, status=None)
  Retry: /repository/pypi-production/simple/sphinx-substitution-extensions/
  https://sonatype3:443 "GET /repository/pypi-production/simple/sphinx-substitution-extensions/ HTTP/1.1" 500 2227
  Could not fetch URL https://sonatype3/repository/pypi-production/simple/sphinx-substitution-extensions/: HTTPSConnectionPool(host='sonatype3', port=443): Max retries exceeded with url: /repository/pypi-production/simple/sphinx-substitution-extensions/ (Caused by ResponseError('too many 500 error responses',)) - skipping
  Could not find a version that satisfies the requirement Sphinx-Substitution-Extensions (from versions: )
Cleaning up...
Removed build tracker '/private/var/folders/b_/l1m2c1r50bz92q5f7khcj96h0000gn/T/pip-req-tracker-ef5entm5'
No matching distribution found for Sphinx-Substitution-Extensions
Exception information:
Traceback (most recent call last):
  File "/Users/fleow/IdeaProjects/sb-connect/venv/lib/python3.5/site-packages/pip/_internal/cli/base_command.py", line 179, in main
    status = self.run(options, args)
  File "/Users/fleow/IdeaProjects/sb-connect/venv/lib/python3.5/site-packages/pip/_internal/commands/install.py", line 315, in run
    resolver.resolve(requirement_set)
  File "/Users/fleow/IdeaProjects/sb-connect/venv/lib/python3.5/site-packages/pip/_internal/resolve.py", line 131, in resolve
    self._resolve_one(requirement_set, req)
  File "/Users/fleow/IdeaProjects/sb-connect/venv/lib/python3.5/site-packages/pip/_internal/resolve.py", line 294, in _resolve_one
    abstract_dist = self._get_abstract_dist_for(req_to_install)
  File "/Users/fleow/IdeaProjects/sb-connect/venv/lib/python3.5/site-packages/pip/_internal/resolve.py", line 242, in _get_abstract_dist_for
    self.require_hashes
  File "/Users/fleow/IdeaProjects/sb-connect/venv/lib/python3.5/site-packages/pip/_internal/operations/prepare.py", line 269, in prepare_linked_requirement
    req.populate_link(finder, upgrade_allowed, require_hashes)
  File "/Users/fleow/IdeaProjects/sb-connect/venv/lib/python3.5/site-packages/pip/_internal/req/req_install.py", line 196, in populate_link
    self.link = finder.find_requirement(self, upgrade)
  File "/Users/fleow/IdeaProjects/sb-connect/venv/lib/python3.5/site-packages/pip/_internal/index.py", line 688, in find_requirement
    'No matching distribution found for %s' % req
pip._internal.exceptions.DistributionNotFound: No matching distribution found for Sphinx-Substitution-Extensions
You are using pip version 19.0.3, however version 20.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command. 

2020-01-23 10:17:57,656-0800 WARN  [qtp722764272-47881]  *UNKNOWN org.sonatype.nexus.repository.httpbridge.internal.ViewServlet - Failure servicing: GET /repository/pypi-production/simple/sphinx-substitution-extensions/2020-01-23 10:17:57,656-0800 WARN  [qtp722764272-47881]  *UNKNOWN org.sonatype.nexus.repository.httpbridge.internal.ViewServlet - Failure servicing: GET /repository/pypi-production/simple/sphinx-substitution-extensions/java.lang.IllegalArgumentException: Illegal character in path at index 82: packages/5d/07/ec7c52ec15910c06f4e6918210ac21ae490137c888e7acb1750cd0d17f42/Sphinx Substitution Extensions-2018.11.12.1.tar.gz at java.net.URI.create(URI.java:852) at java.net.URI.resolve(URI.java:1036) at org.sonatype.nexus.repository.pypi.internal.PyPiIndexUtils.rewriteAbsoluteUri(PyPiIndexUtils.java:215) at org.sonatype.nexus.repository.pypi.internal.PyPiIndexUtils.rewriteLink(PyPiIndexUtils.java:203) at org.sonatype.nexus.repository.pypi.internal.PyPiIndexUtils.lambda$0(PyPiIndexUtils.java:179) at org.sonatype.nexus.repository.pypi.internal.PyPiIndexUtils.makeLinksRelative(PyPiIndexUtils.java:155) at org.sonatype.nexus.repository.pypi.internal.PyPiIndexUtils.makePackageLinksRelative(PyPiIndexUtils.java:179) at org.sonatype.nexus.repository.pypi.internal.PyPiIndexUtils.makeIndexRelative(PyPiIndexUtils.java:169) at org.sonatype.nexus.repository.pypi.internal.PyPiProxyFacetImpl.putIndex(PyPiProxyFacetImpl.java:282) 

Caused by: java.net.URISyntaxException: Illegal character in path at index 82: packages/5d/07/ec7c52ec15910c06f4e6918210ac21ae490137c888e7acb1750cd0d17f42/Sphinx Substitution Extensions-2018.11.12.1.tar.gz at java.net.URI$Parser.fail(URI.java:2848) at java.net.URI$Parser.checkChars(URI.java:3021) at java.net.URI$Parser.parseHierarchical(URI.java:3105) at java.net.URI$Parser.parse(URI.java:3063) at java.net.URI.<init>(URI.java:588) at java.net.URI.create(URI.java:850) ... 185 common frames omitted