Per this thread:
https://www.reddit.com/r/AndroidTV/comments/6z1spp/nbc_sports_gold_app_for_nvidia_shield/
This thread has a recent version of the non-Gold app, not patched but that can be done using Lucky patcher https://www.reddit.com/r/ShieldAndroidTV/comments/8ckoor/ripped_apps_from_fire_tv_3_for_you/
This thread has a recent version of the non-Gold app, not patched but that can be done using Lucky patcher https://www.reddit.com/r/ShieldAndroidTV/comments/8ckoor/ripped_apps_from_fire_tv_3_for_you/