Have you tried contacting the author via their profile page? The author will be the best person to help you as they made the theme.
Yes – Since you purchased it, you’re still able to use it!
Unfortunately authors can delete themes from the marketplaces at anytime. If you know the authors profile page still you can try and contact them to answer any questions you might have though.
If the author decides not to code it, you’ll need to hire a developer to code it for you and put it into Wordpress. You can usually get this done for $150.00-$300.00 if you’re looking for a quality Wordpress theme.
Click “Apearance” > “Themes” > “Install Themes” > “Upload” and then it should let you select a file to upload, then you’ll need to upload the .zip file that you’ve downloaded from themeforest.
(This will all be in your admin dashboard of Wordpress.)
Was the file unzipped?
If it was it looks like it might be a server side error and you might need to contact your web hosting provider.
Here are some things that I see that look like they should be fixed.
1.) On the search part on the left side there seems to be pixel at the very left of it if you look close.
2.) The navigation when you hover over the drop down and then hover portfolio I wouldn’t make them overlap like that.
That’s just some of the things I saw from first glance that I think need to be fixed.