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You can download them as many times as needed. 
Good morning!
While I don't know the answer, maybe I can help! Have you tried posing this over at the API Forum? https://seomoz.zendesk.com/categories/6328-SEOmoz-APIs-and-Extras. That is usually the best place for API issues and questions. If you leave this question open too, we can go at this from two angles.
You'd want to undo that old 301 and replace it with new ones.
If the migration is done perfectly, both domains are already very strong, all content is migrated (and no new keyword cannibalization issues are created), the move should be recognized in a matter of days.
Things to consider:
1. How does the to-be-moved site get crawled and how deeply? A key to successfully moving a site is ensuring that the search engines quickly find all of those 301 redirects.
2. XML Sitemaps can help with a speedy transition. Here is the trick, though. Be sure you have an up-to-date XML Sitemap of the to-be-moved domain just before the transition. Once the move is live, upload the old sitemap to webmaster tools to help get Google looking at those redirected pages.
3. SEO is a relative excercise. There are a lot of variables at play here is both domains show up in the SERPs for the same important keywords. Expect a lot of change as a result of the move. Look out for keyword cannibalization.
I hope this helps!
Lindsay
If the migration is done perfectly, both domains are already very strong, all content is migrated (and no new keyword cannibalization issues are created), the move should be recognized in a matter of days.
Things to consider:
1. How does the to-be-moved site get crawled and how deeply? A key to successfully moving a site is ensuring that the search engines quickly find all of those 301 redirects.
2. XML Sitemaps can help with a speedy transition. Here is the trick, though. Be sure you have an up-to-date XML Sitemap of the to-be-moved domain just before the transition. Once the move is live, upload the old sitemap to webmaster tools to help get Google looking at those redirected pages.
3. SEO is a relative excercise. There are a lot of variables at play here is both domains show up in the SERPs for the same important keywords. Expect a lot of change as a result of the move. Look out for keyword cannibalization.
I hope this helps!
Lindsay
You can download them as many times as needed.
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