[Python-Dev] Win64, 64 Bit Version and 32 Bit version parallel install not possible

"Martin v. Löwis" martin at v.loewis.de
Fri Apr 20 22:11:46 CEST 2007

> I tried to install the 64 Bit python version (2.5.1) and the 32 Bit
> version on my computer.
> But it is not possible because the installer complains that this
> version of python is already installed.
> Is it in general not possible to install both versions (in separate
> directories) ?
> Or is it a bug ?

It's not possible, because they use the same program GUID. You can
use an MSI editor to change the program GUID, then you should be
able to install them simultaneously (you may have to change the
UpgradeCode as well, as otherwise installing one might silently
uninstall the other).

Of course, both installations will stomp on each other's registry
keys, so while this MSI conflict is not deliberate (I never
considered that setup), it may be a good thing that it already
breaks at installation time.


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