Launch fails, wrong path
I have python installed in C:\Program Files\Python27\python.exe, using the standard python.org installer.
After installing with ALLUSERS=1, trying to start scripts explicitly with py.exe, failed, indicating the path C:\Program Files\Pthon27\python.exe did not exist (note the missing y).
After an uninstall of Python Launcher, the the old associations were not restored.
I tried again without ALLUSERS=1, but nothing changed.