Can’t get games with gold game because I already own trial

In the game’s main menu, go down to Xbox Store. Click that, insert your passcode and select “Get” and it will convert your trial to the full game.

uninstall trial version and download gold version with the correct account

You uninstall the old one and then queue the download

http://support.xbox.com/billing/xbox-subscriptions/trial-gold-subscription

The following limitations and restrictions apply to Xbox Live trial subscriptions from games or console bundles:

• If you have an existing paid Xbox Live Gold subscription, you can’t redeem Xbox Live Gold trial subscriptions from games or console bundles to extend your subscription period. However, you can redeem the prepaid code once your current paid subscription
  expires.
• Prepaid codes for Xbox Live Gold trial subscriptions are only available in select games and bundles.
• You can’t access Games with Gold for the Xbox 360 with this type of Xbox Live Gold trial subscription.
• You can’t stack prepaid codes for Xbox Live Gold trial subscriptions from games or console bundles. This means that you can’t start another trial period before your current trial period has finished. However, you can purchase a new paid Xbox Live Gold subscription
  and start the subscription at any time during the trial period.
• If you don’t currently have a paid Xbox Live Gold subscription, there is no limit to the number of times you can use this type of Xbox Live Gold trial subscription.

Hello Pace,

Here at our How to get an Xbox Live Gold trial subscription it is explained that:

The following limitations and restrictions apply to Xbox Live trials from games or console bundles:

• If you have an existing paid Xbox Live Gold subscription, you can’t redeem an Xbox Live Gold trial from games or console bundles to extend your subscription period. However, you can redeem the prepaid code once your current paid subscription expires.
• Redeemable codes for Xbox Live Gold trial subscriptions are only available in select games and console bundles.
• You can’t stack redeemable codes for Xbox Live Gold trials from games or console bundles. This means that you can’t start another trial period before your current trial period has finished. However, you can purchase an Xbox Live Gold subscription and start
  that subscription at any time during the trial period.

Hope this provides enough information.

Best wishes!