How to fix the downed web site with a message of "Error 500"

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The site was originally built on Concrete5.
And is being hosted by Hostmonster.
The site is found to be down today Nov 24, 2020.
Can Concrete5 provide the originally built file to the hosting service provider for them to replace the malfunct server data to fix the downed issue?
Who should I contact at Concrete5 for help?

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JohntheFish replied on at Permalink Reply
JohntheFish
You can find all core versions at
https://www.concrete5.org/developers/developer-downloads/...

However, unless you know it is corrupted code files causing your 500 error, there are many more likely issues such as your host changing php version without you realising.