When the error occurs, take note of the specific mod causing the issue. Try to install the exact same archive again. If MO2 asks if you want to "Merge," "Replace," or "Rename," this is a clear sign that the previous installation attempt partially failed and left incomplete data, strongly suggesting a corrupted download.
When asking for help, always include:
Large modlists require significant storage space. Ensure your drive is formatted correctly and has ample room.
To get back to modding, you usually have to play peacemaker between MO2 and your operating system. The Exclusion Rule: