I have windows 8.1 and tried installing: python-3.5.0rc3-amd64
I tried running as admin to no avail.
Here is the log of the failed install: http://pastebin.com/Y465P6zi.
Manually install the Universal C Runtime update from Microsoft:
https://support.microsoft.com/en-us/kb/2999226
and then re-attempt installation of Python 3.5.
I too had the same issue. Try installing Python 3.4.3. It worked for me.
You may try some older version. I had similar issues and I tried a lot to update but not succeed. Then I tried for python-3.4.3. It's works fine for me. There are not much different between 3.4.3 and 3.5.0.
Please update the window version from windows update(if you have blocked auto windows update). This problem have nothing to do with product key.
Installing older version might help but, won't solve the purpose of installing the 3.5.X version
I had this problem because I was trying to install Python on a computer that had its Windows Updates downloaded, yet not yet installed and configured.
Solution: reboot your computer so that all Windows updates are installed and configured, then try again.
Download python-2.7.14 following link:
https://www.python.org/downloads/release/python-2714/
Install "python-2.7.14" and set PATH variable manual in windows.
Create a New folder in the root of windows drive -> windows ( for example C:\windows\ ) and name it "installer", it's done. install again. it worked for me.
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