2. File damage: If the file where the full version of Du Liang's Third Aerobics 60 Minutes is located is damaged or attacked by a virus, the file may not be opened normally.
3. Network problem: If you download the complete version of Du Liang's third set of aerobics for 60 minutes through the network, it may be affected by unstable network or slow download speed, resulting in the file being unable to download or incomplete.