I am having trouble installing the new ITunes on my PC

I am trying to install the new itunes app on my PC. I already selected "download," and I checked on my computer and it didn't install. Where can I find this app to download?

Also it's been several years since I downloaded my music on my iphone. I lost all of my music when I had to get a new phone. I would like to download my music again on my iphone. Where can I find this. Since I can't load itunes it makes it difficult to do this.

Any suggestions???

Please??