A friend of mine had an old Galaxy S5 running Android 4.4.2. He tried three different "Spotify Premium mods" from sketchy websites. The first one crashed constantly. The second one worked for two weeks, then his account was locked. The third one? It installed a background ad-clicker that ate his mobile data.
Frustrated, he discovered – the official lightweight version designed for older Android versions and slow connections. It worked perfectly on 4.4.2, used less battery, and was completely safe. He got 90% of the features he wanted (playlists, discovery, offline storage for up to 24 hours of music) without risking his account.
I understand you're looking for information about modified Spotify APKs for older Android devices (4.4.2 KitKat). However, I should point out a few important things first: