OpenCart Community

I'm looking for an all-in-one (or at least for all product, categories and options) export/import tool.

The trick is, I need to export from OpenCart 1.5.3., and import to 1.5.6.4 and I cannot find an extension that works with such an old version of OC.

Thoughts?

first upgrade to 1.5.4.x then 1.5.5.x then 1.5.6.1 and finaly to 1.5.6.4

make sure you upgrade any installed extension as well

Can't do that.
Two separate websites and the old site has extensions that will fail with the update.

Need to keep it as it is for now.

Just finished a job like that.
had to manually upgrade and import clients, orders, categories and product.