The platform installer is supposed to erase previous platform
editions before it installs itself.
I would consider that a serious bug.
The Haskell Platform is not like a standard user application, where it
would be reasonable to have only one version installed at a time. If
you are a software developer, it is frequently essential to have
several different versions of the development environment (compiler +
libraries) installed simultaneously, so that you can adequately
support users who have different versions of your own software.
Regards,
Malcolm
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