Not sure where to start to be honest.
And never forget, there is no such thing, as an official DEFAULT OC Upgrade Extension,
it has not been planned, and it will not work, you will kill your DB and your Shop-Setup,
if you ignore one single FACT!
Also, you will be required to change everything, from the theme down to the
last Extension, you used before.
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I would suggest upgrading to v2.2 for sure. It can be tricky but Q has created an upgrade script (look in the 2.x install upgrade section of the forum) and it works well.
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