Just started installing and I'm at 1% after like 15 min. Is it normal and just slow in beginning 1-10% or so, or show I close out of the launcher and start again?

If you already have wings of liberty installed you do not need to "install" hots. Just update your launcher and start playing.

If you "install" hots, you will just be installing wol all over again for no reason.

So, hots cd= useless?

yes

the latest patch downloads all of HoTS stuff, if you wanna bypass the download cuz slow net speed then cd is the way to go and the patch download would be pretty small.