CleanMart v3.9.7 is the latest version already. If you have it, then no need to upgrade.
Are you talking about this topic?
www.flexiblewebdesign.com/forum-virtuemart-template-support/3576-variant-price-not-updating-after-virtuemart-update
Just follow what is suggested in the topic and you will be good to go.
Your topic is closed, NOT BECAUSE you are using an old version, BUT BECAUSE the solution has been provided already.
We don't close any topic unless the solution is provided or the customer tells us that he/she solved the problem on his/her own.
Regards.