First of all, which version of Dolphin are you using? You need to use the latest development build of Dolphin instead of Dolphin 5.0.
The development builds added support for BC7 textures which is not available yet for the official build.
If you use the Master Quest version, using D43 as the folder name suffices, regardless of the region. PZL is for the Collector's Edition instead.
Also, to make sure. You did download version V2.1 of the texture pack? Check the latest pages, the main post is still outdated and shows 2.0 instead.
The development builds added support for BC7 textures which is not available yet for the official build.
If you use the Master Quest version, using D43 as the folder name suffices, regardless of the region. PZL is for the Collector's Edition instead.
Also, to make sure. You did download version V2.1 of the texture pack? Check the latest pages, the main post is still outdated and shows 2.0 instead.