Please check the following:
・Your network environment
*If proxy settings or similar configurations are in place in your network environment, the App may crash during download process. Therefore, please try using a different network.
・Time settings on your device
*If the time on your device differs from the current time, an error may occur.
・Whether the device you are using is a recommended device.
・Ensure that there is enough free space on the device.
If the issue continues after you have checked and tried the above steps, please try reinstalling the App.

https://www.expo2025.or.jp/en/future-index/virtual/virtual-site/#tutorial-sp