Hi Aare,Based on the description, it appears that you are having issues with finding a driver for HTC Sync for Windows 8. I will definitely help you with this issue.1) Do you receive any error message when trying to install the driver?Method 1: I would suggest you to download and install HTC Sync software from the link and then check if it helps.For reference:Support - HTC GratiaMethod 2: If the issue persists, I would also suggest you to install the drivers in compatibility mode and check if the issue persists.Follow the steps to install in Compatibility mode:a. Right click the driver installation file and select Properties then tap or click theCompatibility tab.b. Place a check in the Run this program in compatibility mode for: box.c.
HTCBMPUSBDriverx641.0.5375.msi - Google Drive.
Tap or click the drop down box and select a previous operating system, then tap or clickOK.d. Try installing the driver and check.I hope it helps. If you have any issues regarding Windows in future please let us know.
We will be happy to help you.