It still shows the same error. I have turned off all security products and enabled internet connection but it still gets stuck at 51% and shows the same error. I used microsoft's fixit to scan but it doesn't find any office files. I have removed also them from program files.
Thank you abbodi1406 for all your hard work and contributions. My problems got fixed. I downloaded OfficeRTool2019November28 and re-downloaded office 16 files then used single apps installation. but before I used "sfc /scannow" then "DISM /Online /Cleanup-Image /RestoreHealth" then again ran sfc /scannow to see if any errors were left. I didn't find any errors and proceeded to run OfficeRTool. For activation I used your "KMS_VL_ALL_AIO-36" tool. Thank you and all MDL members for support.