I have been trying to install SIP and PyQt4 + SIP for a while now under windows 10 in a Virtual env (legacy project so was done in PyQt4). I started in PyCharm using the package manager. I also tried command line.
C:\Users\jspada>pip install SIP
Collecting SIP
Could not find a version that satisfies the requirement SIP (from versions: )
No matching distribution found for SIP
C:\Users\jspada>pip install PyQt4
Collecting PyQt4
Could not find a version that satisfies the requirement PyQt4 (from versions: )
No matching distribution found for PyQt4
Is this because there are no builds out there for SIP and PyQt4? PyQt4 maybe because it is a bit legacy but I would think SIP would work.
Well, if the project is so old I guess it's Python 2.7. SIP doesn't have binaries at PyPI for python less than 3.5 and PyQt4 doesn't provide binaries at all.
You have to download sources for SIP and PyQt4 and compile it yourself.
You can find some precompiled packages at Unofficial Windows Binaries for Python Extension Packages.