upgrade to vm2 from vm 1.19 - which file to use

[thambi]

virtuemart1.9.8.RC2G_extract_first.zipvirtuemart1.9.8.RC2H_extract_first.zip
virtuemart1.9.8.RC2i_extract_first.zip
virtuemart1.9.8.RC2J_extract_first.zip
virtuemart1.9.8.RC2k_extract_first.zip
virtuemart1.9.8.RC2L_extract_first.zip
virtuemart1.9.8.RC2M_extract_first.zip
Virtuemart2_joomfish.2.1.7.zip
1.9

hi,
now my site is on vm 1.19 with joomla 1.5 and i wish to upgrade to vm2. please advise which files to use from above list, and if we upgrade thro joomla installation or by manual thro ftp

used the RC2M and installed thro standard joomla installer, went to backend clicked components/virtuemart but getting the below error

Fatal error: Cannot redeclare class vmRequest in /home/techtre6/public_html/administrator/components/com_virtuemart/classes/request.class.php on line 597

thanks
thambi

[robert]

I am interested in the answer to this question as well