I have to say that the threads you have made here and in VB.com are the most painful reading I have done in some time. You have totally ignored the staff, and the basic procedures for making backups before any upgrade, and haven't an understanding on how to restore a backup when things go wrong.

Here's an articles to help:

MySQL Export: How to backup and restore your MySQL database?

Also , on importing db i got this issue :

--------------- Added [DATE]1453314748[/DATE] at [TIME]1453314748[/TIME] ---------------

As I told before , there is something wrong with new version , so I fckt my forum with new version , other versions i did without any issues . And now I need to wait for them idk how long time...

--------------- Added [DATE]1453319251[/DATE] at [TIME]1453319251[/TIME] ---------------

Also , I'm not able to upgrade now my forum ....

is redirecting me to install.php

--------------- Added [DATE]1453320068[/DATE] at [TIME]1453320068[/TIME] ---------------

Why did you post that link , I got here an other issue for 1 day , fck cay , why i did this fcking vb 5.2 ,...

If I will loose data , there is no point to keep that lisence from vb , the issue is not from my side , I did upgrade as i did for other versions ,,, support is slow , and ticked for my lisence are useless , are giving to me url to some documents to read ....

I have seen how slow the support is.
You may also be correct in thinking that there is something wrong with 5.2.0. It wouldn't be the first bad release they have done. I downloaded it yesterday but haven't installed it yet. I always wait for a week or 2 before I install and even then, I do it on a test site.

I have been done numerous times before over this particular piece of software and it won't be happening to me again.

I paid for the license as you did but after all this time, I am now laughing at the whole experience.
It is just another example of what people can get away with selling in this world.

No point in being bitter, nothing concerning these people is going to change.

I will see . I'm just mad , I need to wait because they release shity version which fckt my forum and database , and now they doesn't want to help , idk how in how many days I will fix that ..... Your are lucky that didn't installed this shity version , I'm really dissapointed of support team and vbulletin soft...

I was work a lot on my forum , and I don't want to do it from 0 again...

You are not alone in this. Many people have been through the same shenanigans.
Learn form this as I and countless others have had to.
No point in talking about it much, it is generally not acceptable and heralds the closing of the topic.

You should make copies of all stuff you do, save it in a folder so you never lose it and remember to backup your database. Welcome to the system. . . .
Wish you well.

Yea , and now ? My forum still not fixed ,,,, and support team still doesn't answering to me ....

I would look at the upgrade code and see what DB changes are made, then you can try to reverse those changes (manually). If you don't understand DB's and the coding you can ask for help (which you have been), if you need it ASAP, try asking in the paid forums.

You need to calm down and stop with the swearing though. Yes, your problem was caused by an issue in the upgrade, but it has been expanded by you not having a recent backup.

I will not gonna pay for things which are not cause by me ... There is version vb 5.2 , and I should to get support to get fix that issue , . So you can help me to fix that issue?

How to calm down when my forum is crashed and there is not one who can help me to get my issue fixed , already paste 1 day ,

If you want official support, you should post on vBulletin.com, or open a ticket in the members area.