Why some of my videos are not working?
Mostly this happens when your videos do not match YouTube's recommended aspect ratio. So you can use this latest KillerPlayer version to solve that (after logging-in): https://killerplayer.com/new
But if your videos are still not working then please make sure that your videos do not contain any copyrighted content and are matching YouTube's recommended aspect ratio.
Why I couldn't redeem my code?
Please visit the exact redemption URL that your deal platform provided and use your coupon on that page to solve this issue.