Forum doesn't function after upgrade

[user 1-2-3]

First of all I couldn't upgrade from 3.8.4 to 4.2.5. This is part of a message:
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Step 17 - Skipping step, not needed

Status: Aborted

Action Required

Unexpected Text
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When I decided upgrade to 3.8.11. Now I have the following message when open forum:
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PHP Warning: require_once(..../includes/functions_pt_forumbit.php): failed to open stream: No such file or directory in ..../index.php(67) : eval()'d code on line 3

Fatal error: require_once(): Failed opening required '/home/userdir1/public_html/includes/functions_pt_forumbit.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/userdir1/public_html/index.php(67) : eval()'d code on line 3
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At the same time Control Panel work and I can access it. But the forum - doesn't.

[user 1-2-3]

10 days - no answer.

I found out, that this installation of vB had a vbprojecttools instaled. Where can I get the latest version of it and is it compatible with 4.2.5?

[Mark.B]

Project Tools is no longer a current product and was open sourced many years ago.

What version of php are you running? vBulletin 4.2.5 requires a minimum of php 5.6.

[user 1-2-3]

I use PHP 5.6.30. The installation needs Project Tools files. It's clear from the first post: "functions_pt_forumbit.php" - is a project tools file.

[Mark.B]

I use PHP 5.6.30. The installation needs Project Tools files. It's clear from the first post: "functions_pt_forumbit.php" - is a project tools file.

Best bet for Project Tools is this thread:

https://www.vbulletin.org/forum/showthread.php?t=270346

Project Tools is now open source and some members of the community over there have been helping out trying to keep it running.
I think there's a stable release and a development release, the latter of which is here: https://www.vb-os.com/content/123-Download

Note that none of this is now official, and we are unable to provide any support.