Currently, for python 3.5 with Appveyor, the test falls due to no SIP package found:
searching for SIP
Reading https://pypi.python.org/simple/SIP/
No local packages or working download links found for SIP
error: Could not find suitable distribution for Requirement.parse('SIP')
Command exited with code 1
So for python 3.5 we can think that the good target is sip-4.19.8-cp35-none-win32.whl, and by inspecting https://pypi.python.org/simple/SIP/ it seems that it is existing!
I spend a while to try to fix it without success so currently the CI run for Windows only with python 3.6 and 3.7 (python3.5 is currently commented in appveyor.yml file)
M40V
commented
5 years ago 
Currently, for python 3.5 with Appveyor, the test falls due to no SIP package found:
long format
It's strange because:
For python 3.6 the return is:
Searching for SIP Reading https://pypi.org/simple/SIP/ Downloading https://files.pythonhosted.org/packages/7a/49/67cc7955baf2ec5b67e141da2ab2a436cbf0f8d7c9fcab54e35df21d056b/sip-4.19.8-cp36-none-win32.whl#sha256=74da4ddd20c5b35c19cda753ce1e8e1f71616931391caeac2de7a1715945c679 Best match: sip 4.19.8 Processing sip-4.19.8-cp36-none-win32.whl Installing sip-4.19.8-cp36-none-win32.whl to c:\python36\lib\site-packages Adding sip 4.19.8 to easy-install.pth file Long format
For python 3.7 the return is:
Searching for SIP Reading https://pypi.org/simple/SIP/ Downloading https://files.pythonhosted.org/packages/89/34/056db01926839dd05f80a08a579ee2f4f6625913b0620580ee580fa05fbf/sip-4.19.8-cp37-none-win32.whl#sha256=1bb10aac55bd5ab0e2ee74b3047aa2016cfa7932077c73f602a6f6541af8cd51 Best match: sip 4.19.8 Processing sip-4.19.8-cp37-none-win32.whl Installing sip-4.19.8-cp37-none-win32.whl to c:\python37\lib\site-packages Adding sip 4.19.8 to easy-install.pth file Long format
So for python 3.5 we can think that the good target is sip-4.19.8-cp35-none-win32.whl, and by inspecting https://pypi.python.org/simple/SIP/ it seems that it is existing!
I spend a while to try to fix it without success so currently the CI run for Windows only with python 3.6 and 3.7 (python3.5 is currently commented in appveyor.yml file)