To run the vbAdvanced installer, go to your forum, then scroll all the way down.
At the bottom of the page on the righthand side, you will see the word "Admin". Click that to go to what is called the Admin Control Panel or AdminCP/ACP for short.
In the browser address bar (this is at the top of your browser, where you see the URL of the site, for example it displays
https://vborg.vbsupport.ru/showthread.php?t=266471 currently - if you are having trouble locating it, this page should help you find it:
http://en.wikipedia.org/wiki/Address_bar), you will see the domain of your site, then at the end of the URL you will see this: /admincp/index.php
Highlight the part that says "index.php" and change it to: vbacmps_install.php
So the end of the URL will look like this: /admincp/vbacmps_install.php
Keep everything else the same except changing "index.php".
Then press enter, and it should run if you uploaded the file.