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I bought 4 books from Kobo store desktop app. I downloaded the books as Kobo ePub (ePub option unavailable on Web portal or Desktop). All I'm trying to achieve is to remove DRM for my tablet. (I have spent two days on this to no avail).

After downloading from Kobo Desktop to PC.
I changed file extension manually to epub, because no file extension visible.
I added the books to Calibre from Kobo Desktop PC directory, (successful).
I run Obok DeDRM and get the following error,

calibre 6.5 embedded-python: True
Windows-10-10.0.19043-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19043')
Python 3.10.1
Windows: ('10', '10.0.19043', 'SP0', 'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeDRM (7, 2, 1) && KePub Output (3, 6, 3) && Kobo Utilities (2, 16, 6) && Manage Series (1, 4, 0) && Modify ePub (1, 7, 3) && Obok DeDRM (7, 2, 1) && Quality Check (1, 12, 0) && Resize Cover (1, 1, 1)
Traceback (most recent call last):
File "calibre_plugins.obok_dedrm.action", line 135, in launchObok
File "calibre_plugins.obok_dedrm.dialogs", line 102, in __init__
File "calibre_plugins.obok_dedrm.dialogs", line 154, in populate_table
File "calibre_plugins.obok_dedrm.dialogs", line 179, in populate_table_row
File "calibre_plugins.obok_dedrm.dialogs", line 439, in __init__
File "calibre_plugins.obok_dedrm.dialogs", line 412, in __init__
AttributeError: type object 'QTableWidgetItem' has no attribute 'UserType'