Ibn Hajar writes:
وقد أخرج بن الضريس من حديث بن عمر أنه كان يكره أن يقول الرجل قرأت
القرآن كله ويقول إن منه قرآنا قد رفع
“Ibn ad-Durays has narrated a report of Ibn ‘Umar that he used to
dislike the person who said, ‘I have recited the whole of the Qur’an.’
He (Ibn ‘Umar) used to say, ‘But (the reality is) a part of the Qur’an
has been abrogated.’
This word ( serviceable صالحة ) is Mansukh (was not in the final revise of Quran Jebreel and the Prophet recited twice in the last Ramadan of the Prophet's life ﷺ) the written in mushaf now does not have that word. The companions wrote the Quran as per that last presentation.
All that was revealed of Quran is from Allah and all is there in (Om Alkitab, or ...
It's quite evidently a variant of said verses.
As the hadith tells that Ibn Abbas recited alike, it is also quite clear that he considered it a part of the Qur'an.
The hadith does not relate whether this version is erroneous, abrogated or an equally valid variant. The reason that the hadith was related was the observation of the difference so that the ...
"May be used for non-commercial, personal, research, or educational purposes, or any fair use".
You said you used it for educational purposes, so it is legally and Islamically allowed.
Aslong as the book is free for non-commercial, personal, research, or educational purposes, it is perfectly halal (if the contents aren't haram) to read them.