well, I never checked on this, but I don't really expect anyone, to invest
a huge amount of time in such, just to make others happy. V-3.0.2.x is
too much different from anything else before, and as long as there is
no end of further 'changes' in sight, free and really working Upgrade
Scripts will likely not be available.
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But you only need a Database 'Upgrade', if you installed a 'virgin' OC-3,
and if one creates Income with a Shop, this should be worth, paying a few
bucks for it.
Otherways, one should just not have changed, for no good reason at all ...
always to belong to the First, seldom or never comes for free !
Good Luck !
Ernie
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Opencart Migration & Remote Upgrade Tool
https://www.opencart.com/index.php?rout ... n_id=24347
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or then something like this would possibly be able, to re-import
your DB-Content into a new v.3 DB, but you have to contact the Seller
about such first.
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(1.5x, 2.x & 3x) Product Import Export Tool Multi-language
https://www.opencart.com/index.php?rout ... n_id=25297
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Product Import Export Pro
https://www.opencart.com/index.php?rout ... n_id=30686