"This page isn't working" when attempting to install older version

[Bronze]

I have an older license for Xenforo 1.4.5 that I'm trying to install. I've uploaded the files into a "forum" directory inside public_html via FileZilla. Two files show as not transferring properly (Reflection/Docblock.php and Amazon/Accessories.php).

Not sure if that could be related, but the upload otherwise completes, then I enter mysite.com/forum or mysite.com/forum/install and it gives me an error page either way:

"This page isn't working" and HTTP ERROR 500

Any thoughts? I wasn't...

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"This page isn't working" when attempting to install older version

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