Migrating from 1.1.9 to vm 2

[banditir]

Hi Dear Sir
Joomla Version 1.5.26
old vm version 1.1.9
I Have Tryed To Migrate to new virtuemart because the price stoped to showing and no body could help me as shown on
https://forum.virtuemart.net/index.php?topic=109885.msg369920#msg369920

I Tryed To Install New Vm i mean migrate to new version

i've followed
http://dev.virtuemart.net/projects/virtuemart/wiki/Upgrading_VM1_to_VM2_with_provided_packages

new version was successfully installed but when i clicked on sample data ( don't sure , something like this , right after installing) the white page showed on this url
index.php?option=com_virtuemart&view=updatesmigration
i tryed to refresh , but it still gives blank page in fire fox and in chrome gives
HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request.

the vm is not visible in components menu , but it is visible in extension manager

please tell me what is wrong and what should i do