It further entered the top 50 in 15 other countries, including Australia, the Commonwealth of Independent States (CIS), Germany, Ireland, New Zealand and Switzerland.

To further promote the song, the singer performed it at a number of televised events, among others at the Bambi Awards, BBC Radio 1's Big Weekend, Germany's Next Topmodel and The Tonight Show Starring Jimmy Fallon.

Prior to its release, Ora started to tease "I Will Never Let You Down" in mid-March 2014, uploading the single's cover art and a preview of the music video.

[6][16] The song begins with an intro utilising guitars and synths as well as hip hop beats, which progresses into a disco and dance-described party.

Writing for Teen Vogue, Phillip Picardi proclaimed the song as "the feel-good anthem you need to cure your Monday blues", while Casey Lewis of the same magazine felt that "[it] is one of those tracks that makes an enormous head-bobbin', toe-tappin' impression just a few seconds in, and then halfway through you already can't wait to start it over again".

[36] It further earned gold certifications by the Bundesverband Musikindustrie (BVMI) in Germany, Federazione Industria Musicale Italiana (FIMI) in Italy and IFPI Danmark in Denmark.

[51] Taking place in Los Angeles, the three-minute and 27-second video was directed by Italian director Francesco Carrozzini and displays several sequences of Ora, alternating between black-and-white and color segments.

[50][54] The camera then focuses on one of the photographs, which starts to transform into an animated picture, displaying the singer singing in a darkly lit surrounding.

[50] Next, a close-up segment shows her in an outdoor-setting walking and dancing in the camera's direction, before being accompanied by two backup dancers Polly and Sophie Duniam.

[53] Christina Garibaldi for MTV noted the video's '80s theme, feeling "like a high-fashion photo shoot as it fully encompasses the fun vibe of the song".

[55] Marissa G. Muller of the latter publication commended Ora's "killer" clothes, commenting: "We're left wanting to see more, which—hey—is the mark of a great video.

[20] Lipshutz for Billboard likewise praised her presence in the video, adding that "[it] re-imagines the carefree rabble-rouser from the 'How We Do (Party)' clip as an elegant model".

[56][57] In May, the singer appeared to perform the song at the ninth season final of German reality show Germany's Next Topmodel as well as at BBC Radio 1's Big Weekend in Glasgow.