If the Adodb program file in $extract_dir exists and $zip_file does not exist, use the Adodb program file in $extract_dir.
If the Adodb program file in $extract_dir exists and $zip_file exists; then compare the modification time and the Adodb program file in $extract_dir is updated to the newer one.
If the Adodb program file in $extract_dir does not exist and $zip_file exists; then the Adodb program file in $extract_dir is decompressed from $zip_file.
If the Adodb program file in $extract_dir does not exist and $zip_file does not exist; download the Adodb Zip file from $zip_url and decompress the Adodb program file.
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