Hello,
My name is Valerie, I work with BelVG team as project manager.
Our team can offer you the upgrade which would be processed in the following order:
1) installation of the latest Magento version
2) transfer of all products, orders, customers from the old database
to the new one
3) installation of the old theme for the new version
4) installation/upgrade of all extensions and their customization for
the new version (if needed)
5) testing (design, html coding, test orders etc.)
6) synchronization - right before switching stores, transfer of all
latest orders, customers, products that would be done/created for time
of upgrade
7) making new upgraded version as live version
On average such work can take from 40 to 120 hours accordingly to the site customization, number of extensions, custom theme, number of clients and orders.
(1h=$30)
We are looking forward to hearing from.
Thanks,
Valerie