AttributeError: module 'comtypes.gen.CSiAPIv1' has no attribute 'cOAPI'

[sunyaer]

Windows 7, Pycharm 2020, Python 3.7, comtypes 1.1.10, attach to Etabs 18.1.1 instance:

 import sys
import comtypes.client

# set the following flag to True to attach to an existing instance of the program
# otherwise a new instance of the program will be started

AttachToInstance = True

if AttachToInstance:
    # attach to a running instance of ETABS
    try:
        # get the active ETABS object
        myETABSObject = comtypes.client.GetActiveObject("CSI.ETABS.API.ETABSObject")
    except (OSError, comtypes.COMError):
        print("No running instance of the program found or failed to attach.")
        sys.exit(-1)

# create SapModel object
        SapModel = myETABSObect.SapModel

# initialize model
SapModel.InitializeNewModel()

Error:

File "C:/Users/.../Desktop/Etabs Python/getPierForces.py", line 16, in <module>
myETABSObject = comtypes.client.GetActiveObject("CSI.ETABS.API.ETABSObject")
File "C:\python37\lib\site-packages\comtypes\client\__init__.py", line 183, in GetActiveObject
return _manage(obj, clsid, interface=interface)
File "C:\python37\lib\site-packages\comtypes\client\__init__.py", line 188, in _manage
obj = GetBestInterface(obj)
File "C:\python37\lib\site-packages\comtypes\client\__init__.py", line 112, in GetBestInterface
interface = getattr(mod, itf_name)
AttributeError: module 'comtypes.gen.CSiAPIv1' has no attribute 'cOAPI'

I've searched the forum and found similar threads, and run unRegisterEtabs.exe, and RegisterEtabs.exe, but with no luck to fix the issue. There is a thread which modifies the_init_.py to make it work, but doesn't explain where to modify, so this looks a bit overwhelming to me. Could anyone shed some light on how to fix the error? Thanks in advance.