Virtuemart Component Missing in back end after upgrade to latest version

[joknight]

I am running Joomla 2.5.19 with Virtuemart 2.0.26d
I just tried to upgrade to latest 2.6.0 but the Virtuemart Component in the backend has disappeared and I cannot open virtuemart
Please advise as to what I can do to get the component showing again in the backend
Thank you,
Joanne

[jenkinhill]

Forum search:
http://forum.virtuemart.net/index.php?topic=121979
http://forum.virtuemart.net/index.php?topic=119218
http://forum.virtuemart.net/index.php?topic=121427
and others

[joknight]

Hi Kelvyn,
Thank you for your reply, however, it seems those three links reference disabling Xmap but I'm not using Xmap - I use JSitemap Pro and disabling that does not make a difference.
If it helps when I try to install the extension from 2.0.26d to 2.6.0 I get this error message:

-1 - An error has occurred.

Copy failed

Return to Control Panel


...The AIO installed with a success message

[jenkinhill]

Have a look at this:  http://forum.virtuemart.net/index.php?topic=123213.msg420933#msg420933