EDIT: didn’t read post properly
You need to login using the account which purchased the theme and talk to the auhtor
Yes – I think you can look for partnerships here but full out sales of rights to files from here or otherwise is not allowed here
As long as you own it or have the rights to develop it
email the author and ask for their help or for them to unlock it.
If the video is “private” then that is nothing to do with the theme it means you need to change the settings on the video to public
Slider definitely – you need permission. You don’t have to provide it with the submission but if you don’t have it your file will get taken down. Isotope – that’s open source isn’t it? If so that’s fine you can just use it (within the license confines).
Basically if its off CodeCanyon then get permission. The ThemePunch guys ( Rev slider) are great and will help how they can I am sure
You need to sign in with the account that purchased the theme
Approval can be anything up to 5 days or more at the moment. You do know that to use those items in your file you do not just need to have purchased them – you have to have the full permission of the author also. Assuming you have that then you do not need to include any license docs.
Once you have downloaded it you can only refund/exchange it if it is broken or not as described in the demo but both those plugins are free.