As i am seeing in your order details, you have purchased our VM template when there was VM2.0.8 was out.
LOTS of things have changed with Virtuemart since then, so has our VM Template. Virtuemart keeps improving in every single release and things are changing; parameters, variables the way things work etc... Some changes in some sections make our VM Template fails to work in some cases, in these kind of situations, we are also updating our VM Template to make it compatible with that new VM version. (usually in 2 days after new VM comes out)
You can do these changes by yourself though Virtuemart DEveloper release a "release history" list to point out what they have changed in the new version for templaters. You can follow the release history, but from VM2.0.8 to VM2.0.18a you would need to do lots of thing.
So yes, you need to update our Virtuemart Template as well. Or get back to VM2.0.8 which i believe it would be the worst thing to do. New versions are always safer, because usually the updates are all about security updates to make Virtuemart more secure.
Also as i am seeing in your order you have purchased the template with individual license which doesn't include the "free update", therefore you need to upgrade your order to "developer license" in order to receive free updates from us.
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