Install VirtueMart 2 directly with the joomla installer

[Dreeg]

Hi all,

i'm trying to migrate VM 1.1.9 (on Joomla 1.5.26) to VM 2.0.14 (on Joomla 1.5.26, i can't migrate now my Joomla).
Following this guide: http://dashhelp.com/tutorials/joomla-tutorials/75-migrate-virtuemart-1-1-9-to-version-2-0-updates

Goes well until the Step 1, Point 6. "Install VirtueMart 2 directly with the joomla installer"

VM 2.0.14 is installed:

info

        Info: User data stored
        Info: Vendor data stored
        Info: Sample data installed!!
        Info: alterTable CHANGE jos_virtuemart_waitingusers.notify_date : ALTER TABLE `jos_virtuemart_waitingusers` CHANGE COLUMN `notify_date` `notify_date` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
        Info: Taking config from file

        1
        Table updated: Tablename jos_virtuemart_waitingusers dropped: 0 altered: 1 added: 0
        Installazione componente: eseguita correttamente

Warning

        Warning, the Safe Path is empty, for safety reasons it is very important to create a folder in a path not accessible by an URL, create also a folder invoices in it to store your sensitive data secure. Our suggested path is for your system C:\xampp\htdocs\vmfiles, use this link to the config

When I click on "Go to the Shop" button, I get a completely white screen with this URL: [my_local_site]/administrator/index.php?option=com_virtuemart&task=disableDangerousTools&token=20e25edda744d06f69898701a2d0fc9a

If I go to VM from the menu does not change anything.
How do I proceed with the migration?