Error pagination pages 1-5 to return to another category shows the current

[arkangel]

Virtuermart I have 2.0.6 and I have a problem with the pages of products, I have to show 10 products per page, but when I have 2 or more pages when I want to see another category of products and also has several pages does not start from page 1 the link takes me is on page 2 or more that I have displayed in the above category.

[jenkinhill]

VirtueMart 2.0.6 is very old and insecure. The pagination bugs are fixed in later versions, so maybe you should consider updating?

[arkangel]

vm 2 after upgrading to latest version 2.0.20b fixed problem plugins pagination but I funcioana and since I have no admin access to vm.
That is the php file that handles the paging
Start 1 2 3 4 5 Final
Is to try to fix the error with the update manually but php is not that neither I nor my partner we are somewhat stuck in this.
A help please, which is the php file that handles the paging