1.0062A is based on a much older and buggy 1.0029A master. They just added some improvements, but the 1.0034A does still have more fixes than 1.0062A. The source code got lost from the 1.0034A so they had to take the much older 1.0029A source code for the GOG and Steam versions.
You can read here about that. It's in german.
Ogdb.eu
baallukor1001
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