Adapt install doc for separated archives for each platform (#697)

[zigarn]

Fixes #697 (doc)
Related issue: #699

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[zigarn]

/assign @corneliusweig

[ahmetb]

/hold
Until we make a release available.

[corneliusweig]

/lgtm
We need to delay merging, until the next release is out.

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Issues go stale after 90d of inactivity.
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/lifecycle stale

[zigarn]

/remove-lifecycle stale

[corneliusweig]

/lifecycle frozen

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/lifecycle stale

[zigarn]

/remove-lifecycle stale

[chriskim06]

/hold cancel
/approve

new release is out, and we had an issue opened about this. my bad, I didn't notice this when I made the release earlier

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chriskim06, zigarn

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[chriskim06]

oops just realized the lgtm got removed when this went stale

/lgtm

[corneliusweig]

@chriskim06 great that you thought about merging this one!