Has this been brought up / discussed on the mailing list or on the IRC channel?

@Ladsgroup is managing the nightly builds so they know the best if it's possible to have older versions still available. E.g. have one for the last 7 days, then 3 additional for every 7 days to cover 4 weeks without wasting to much space (if that is a concern).

For now it's possible (in theory) to use git to download any version. And the script to generate the nightly build is available online on github so in theory it's possible to modify it to download any version and create a nightly-like package from that.

Done:
https://github.com/pywikibot/Pywikibot-nightly-creator/commit/deb228aa9eb7c583313d51ab1982f2395c355b22

Could you please add short instruction on how to use this? Thank you :-)

AFAIK you just need to use http://tools.wmflabs.org/pywikibot/core_old.zip although it currently returns a 404 so maybe the URL is wrong or it didn't create a old build yet.

@Ladsgroup I don't know if the link will appear as soon as it is available but if not could you please add one in https://tools.wmflabs.org/pywikibot/ ?

The link is working now :) I add the link the pywikibot page ASAP

The link is there now

So we have now tags (at least ONE tag) so do we want to add these too? So that we have builds for each tag (in theory we only need to build them once). On the other hand all those are probably on pypi too (at least currently).

Done