[issue27314] Cannot install 3.5.2 with 3.6.0a1 installed

[Roundup Robot]

Roundup Robot added the comment:

New changeset 85460db4c310 by Steve Dower in branch 'default':
Closes #27314: Fixes launcher installer upgrade table.
https://hg.python.org/cpython/rev/85460db4c310

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nosy: +python-dev
resolution:  -> fixed
stage: test needed -> resolved
status: open -> closed

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[issue27314] Cannot install 3.5.2 with 3.6.0a1 installed

[ppperry]

Changes by ppperry :


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components: +Installation

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[issue27314] Cannot install 3.5.2 with 3.6.0a1 installed

[Larry Hastings]

Changes by Larry Hastings :


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nosy:  -larry

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[issue27314] Cannot install 3.5.2 with 3.6.0a1 installed

[Steve Dower]

Steve Dower added the comment:

Okay, it's not an issue with the newer versions, and I don't see any reason to 
worry about 3.6.0a1.

One issue that remains is that installing the launcher with 3.6.0 creates a 
separate add-remove programs entry and doesn't remove the 3.5.2rc1 entry, but 
the reference counting on files seems to be fine, so it's not a big deal and 
something I'll fix before 3.6 releases.

--
priority: deferred blocker -> normal
versions:  -Python 3.5

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[issue27314] Cannot install 3.5.2 with 3.6.0a1 installed

[Steve Dower]

Changes by Steve Dower :


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nosy: +Steven.Barker

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[issue27314] Cannot install 3.5.2 with 3.6.0a1 installed

[Steve Dower]

New submission from Steve Dower:

(Originally posted as a comment to issue26631 but confirmed separately.)

For 3.5.2 and 3.6.0a2, I updated the installer for the launcher so that it is 
always shared between Python versions (i.e. if you install 3.6 followed by 3.5, 
it won't touch the launcher because there's a "newer" one there).

However, because this didn't make it into 3.6.0a1, there is actually a version 
conflict that breaks installation.

I've marked this a deferred blocker for now and brought in the two RMs. I 
believe (and will test with the RCs) that this won't recur with the latest 
versions. It can also be easily worked around by choosing not to install the 
launcher.

We haven't seen this before because there have been no supported "downgrade" 
scenarios (i.e. installing 3.5.0 over 3.5.1 aborts at the start, well before 
this error would be seen).

--
assignee: steve.dower
components: Windows
messages: 268500
nosy: larry, ned.deily, paul.moore, steve.dower, tim.golden, zach.ware
priority: deferred blocker
severity: normal
stage: test needed
status: open
title: Cannot install 3.5.2 with 3.6.0a1 installed
type: behavior
versions: Python 3.5, Python 3.6

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