Troubles with upgrading to the 5.7.4 beta (third party libraries not installed)

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Hello everybody. The upcoming 5.7.4 version introduces many positive changes to the Conversation block and I need it now, so I decided to manually update my concrete5 with the beta version found at Github:https://github.com/concrete5/concrete5-5.7.0...

What I did:
1. Download the ZIP from Github and copy the /web/concrete folder.
2. Paste it into my siteroot/updates/concrete5.5.7.4/ directory.
3. Use the Dashboard interface to update concrete5.

Now every page on my website returns the following error:
"Third party libraries not installed. Make sure that composer has required libraries in the concrete/ directory."

I learned it has something to do with the concrete/vendor folder, which wasn't included with the Github release (or so I think). I have backups and can revert to 5.7.2 with no problems (and it's still local testing, so no hurry), but I'd like to get the 5.7.4 beta to work.

OrionFOTL
 
MrKDilkington replied on at Permalink Best Answer Reply
MrKDilkington
I believe you need to use Composer to download the dependencies.

There are some instructions on the first page of the Github.
https://github.com/concrete5/concrete5-5.7.0...