New submission from J. Morton <>:

Got a 0x8070666 "Setup Failed - another version installed" popup message when 
installing 3.6.3 with 3.6.4 and 3.5.1 already installed (all are "just for me" 
installs). The problem is independent of word length.
It should be possible to install any/every earlier version (within reason) 
provided the earlier version is "virtualized" by being placed in it's own 
folder (which I was what I was doing). 
Please accomodate this capability as it is often needed to support users using 
earlier versions of Python. 

Environment: 64 bit Win7 Enterprise SP1 on a IM controlled machine. Possible 
red herring: IM recently upgraded java on this machine to "1.8.0_151".  32 and 
64 bit versions of all releases are installed on this machine.

components: Installation
messages: 312138
nosy: NaCl
priority: normal
severity: normal
status: open
title: Must install python 3.6.3 when 3.6.4 already installed
type: behavior
versions: Python 3.6

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