Moving changes from one instance to another

I need to move changes from dev1 instance to dev2 and create upgraded managed package in dev2. I create unmanaged package in dev1 (managed are not allowed there) and try to install to dev2, it shows error about duplicates that come from a previously installed unmanaged package in dev2. So I try to uninstall previous package, and it can’t uninstall because there is a component that is referenced by the managed package, the same package that I need to upgrade. It doesn’t specify which component.
How can I pass changes from dev1 to dev2 in a reasonable way without deleting existing managed package in dev2?

Answer

You should look into using the ANT Migration Toolkit to move your changes. http://www.salesforce.com/us/developer/docs/daas/

Attribution
Source : Link , Question Author : Alexey , Answer Author : Daniel Hoechst

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