so reintalled everything now it compiles 
yay
but does not upload 
when i try to upload com port goes offline right away and i get message below…
note i did have driver problem there was no driver so i used zusb to install CDC driver
any recomendations?
Sketch uses 43024 bytes (5%) of program storage space. Maximum is 811008 bytes.
Global variables use 7188 bytes (3%) of dynamic memory, leaving 230380 bytes for local variables. Maximum is 237568 bytes.
Upgrading target on COM15 with DFU package C:\Users\LZ-Main\AppData\Local\Temp\arduino\sketches\1A3674CF2911C8028729E7223A0DE2E5\blinky.ino.zip. Flow control is disabled, Single bank, Touch disabled
Failed to upgrade target. Error is: Serial port could not be opened on COM15. Reason: could not open port 'COM15': FileNotFoundError(2, 'The system cannot find the file specified.', None, 2)
Traceback (most recent call last):
File "dfu\dfu_transport_serial.py", line 113, in open
File "serial\serialwin32.py", line 33, in __init__
File "serial\serialutil.py", line 244, in __init__
File "serial\serialwin32.py", line 64, in open
serial.serialutil.SerialException: could not open port 'COM15': FileNotFoundError(2, 'The system cannot find the file specified.', None, 2)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "__main__.py", line 296, in serial
File "dfu\dfu.py", line 235, in dfu_send_images
File "dfu\dfu.py", line 157, in _dfu_send_image
File "dfu\dfu_transport_serial.py", line 115, in open
nordicsemi.exceptions.NordicSemiException: Serial port could not be opened on COM15. Reason: could not open port 'COM15': FileNotFoundError(2, 'The system cannot find the file specified.', None, 2)
Possible causes:
- Selected Bootloader version does not match the one on Bluefruit device.
Please upgrade the Bootloader or select correct version in Tools->Bootloader.
- Baud rate must be 115200, Flow control must be off.
- Target is not in DFU mode. Ground DFU pin and RESET and release both to enter DFU mode.