I also got this error, first I found the file it written in the last line (text.py) and went to the relevant place. There written --- elif tag == "i": ----, I changed "i" to "I" and saved the file again, it did not give an error in the first scene but it gave an error in the next scene. This time the error was ---Exception: Unknown text tag 'i' ---. In other words, we can say that the developer used the "I" tag in some places and the "i" tag in some places to make the texts italic while coding that part. My solution was to make the relevant place --- elif tag == "i" or "I": ----. In this way, if "I" or "i" is used for italics in the codes, it will not give an error. I played those parts without any errors. Notepad application is enough for you to edit the file, nothing extra is needed. In fact, I will upload the file I edited for you. There is just fix for the 1530th line of the text.py file.
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