I can’t download my theme
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Thank you for your submission. We have completed our review of “77Theme” and unfortunately we found it isn’t at the quality standard required to move forward, and you won’t be able to re-submit this item again
That means your item doesn’t meet the standards required to be approved for sale. Therefore, you must re-build it taking into account the quality required by the marketplace you cater for. Cheers! 
I don’t know if you can send me a video explaining the steps Thanks.
There are no videos teaching you how to create items for the Envato Marketplaces. This is a marketplace, if there would be videos for this, everyone would be an author!
Listen to recent tracks added to Audiojungle that have had sales in the genres you want to make. Then make sure your music is of the same quality or higher.