SilverUI2 was created by SilverLion
If you're looking for a simple but attractive UI, I suggest using the original, if you want a complete overhaul, look no further, up-to-date with Legion and able to satisfy your ever need, there are MANY more addons included, and every class is covered with the exception of the spell ring, it is limited to those I've managed to complete successfully. BOTH 21:9 (1440P) and 16:9 (1080P) are included.
Youtube installation tutorial: HERE
Advanced tutorial: HERE
Step 1: Unzip and Install
-> Download and unzip SilverUI2Reloaded.zip
-> Go to C:\...\World of Warcraft and replace your Interface folder with the one extracted from SilverUI2Reloaded
-> Go to C:\...\World of Warcraft\WTF\Account\"YOURACCOUNTNAME"\
and remove your SavedVariables folder and your realm name folder(s). Now put in SavedVariables from SilverUI2Reloaded.
Step 2: In-game config
-> ElvUI skip setup; Select ElvUI chat to disable
-> Access ElvUI with the slash command /elvui or in the game menu by pressing escape
-> From the Profile option select 'DEFAULT'
-> ElvUI Disable the following: ActionBars; Bags; Buffs; UnitFrames;
-> ElvUI AddonSkins Disable: bagnon; bartender4; skada; weakauras;
-> ElvUI AddonSkins Enable: parchment remover
-> Bartender4 /bt choose healing or damage from the optional profiles