Hello IrisTran,
Sorry for long delay in getting back to this post. Based on the product number you provided E0K41UA, HP web site recognize your systems as “HP ENVY TouchSmart m6-k015dx Sleekbook” and there is no BT drivers posted on HP web site for Win8.1 but they do have Intel and Broadcom BT Driver packages for Win8. So I'm unclear if your system has Intel or Broadcom Bluetooth Radio. Initially you had issues installing Intel package and later it worked. Please follow the steps below to find the Manufacturer ID for your BT Radio. For Intel it will be 2 and for Broadcom its 15.
- Press Windows Key + X key and click Device Manager.
- Expand "Bluetooth" node.
- Right-click on the node that has “Bluetooth Radio Adapter” listed and click on ‘Properties’.
- On “Advanced” tab you will find Manufacturer ID.
Based on the Manufacturer ID you may try BT drivers from HP Web Link below. Bluetooth drivers for Win8 are under “Driver-Network” section.