As a brief followup, new 8.4.3 installers for windows have been
released (both core and full), which resolve a few issues brought
about by the switch to automatic modification of "extra-prog-path" and
related, and the corresponding hashes have been updated.
> On behalf of the Haskell Platform team, I'm happy to announce the release of
> Haskell Platform 8.4.3
> Now available at
> https://www.haskell.org/platform/ >
> This includes GHC 8.4.3, cabal-install 220.127.116.11, and stack 1.7.1.
> A full list of contents is available at
> https://www.haskell.org/platform/contents.html >
> Outside of the update of the GHC to 8.4.3, the only substantive change
> in this release is to the new version of the primitive library, which
> includes a range of fixes and improvements.
> The list of GHC changes is available at:
> https://ghc.haskell.org/trac/ghc/blog/ghc-8.4.3-released >
> And the list of changes to Primitive is available at:
> http://hackage.haskell.org/package/primitive-0.6.4.0/changelog >
> There are (still) currently no 32 bit Windows builds available. We're
> looking into the issues preventing us from building an installer for
> that platform. The components all appear to work individually in such
> a case, and can be installed separately by users who so desire.
> Happy Haskell Hacking all,