Smf2.1: Can't install language pack through the admin panel

[Dzonny]

As reported here:
https://www.simplemachines.org/community/index.php?topic=563258.msg4010388#msg4010388

When you try to install new language through the admin panel, error appear:
"The Simple Machines site is not responding. Please try again later."

[albertlast]

Its not so helpfull when you use a url to a private part of sm.org on a public github repo.

[smfbigguy]

I get the same as Dzonny. No errors or anything come with it but it just won't install any language. Well, just the warning appears as above.

[VBGAMER45]

I am not sure if that can be fixed till final. It checks using SMF version for language packages on the SMF site

$url = 'https://download.simplemachines.org/fetch_language.php?version=' . urlencode(SMF_VERSION);

[Sesquipedalian]

Apparently https://download.simplemachines.org/fetch_language.php doesn't currently expect to receive strings like "RC1" in the version parameter.

[jdarwood007]

I did some adjustments to the site code. Seems to have resolved this. Will do some more verifications later but I think its fixed.

[gnysek]

I can confirm it worked on my local installation, which previously was giving this issue.

[SychO9]

It's working now

[smfbigguy]

Works for me.

[jdarwood007]

FYI,
There was some slight adjustments made after this closed to the handling here. If it broke again, let me know. I tested with the latest versions and they work fine. Old versions do not work on on purpose to pull language packs down.