Have you tried entering the promotion manually? Game Courier's features were added in stages, and older presets need to be rewritten to benefit from newer features. Promotion is not mandatory until the last rank, and the ability to prompt you about available promotion options is a newer feature. The code for Eurasian Chess is so old, it was ending every line with a semicolon instead of using a colon after lines that introduce blocks of code.
Have you tried entering the promotion manually? Game Courier's features were added in stages, and older presets need to be rewritten to benefit from newer features. Promotion is not mandatory until the last rank, and the ability to prompt you about available promotion options is a newer feature. The code for Eurasian Chess is so old, it was ending every line with a semicolon instead of using a colon after lines that introduce blocks of code.