I've solved the problem! I simply removed the ETC files from the old archive files during the 18.4.12 update and added them to my own pack files. Everything worked smoothly after that! Big thanks to @ Mali for their help - you're an amazing person!
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Hi, unfortunately, since I'm new, it's difficult for me to understand some things. That's why I wanted to ask: where exactly should I add the code from the .py file inside the root folder in the downloaded file? Thank you also for your sharing.