The old LO writer file does not open after the update

In the 6.4 Version I made a 200+ page document in Libre Office Writer.
It does not open after updating to the latest version 7.0.2 and
Shows not responding when trying to open. What to do to fix it. Please reply ( i am using Windows 8 PC (64 bit))

After an update, the list of “Recent documents” is reset. Look where it was saved and double-click on its icon. Or use File>Open and navigate to its location. Once opened, it will be listed in the recent documents list.

Is your anti-virus blocking access to folders? Look for anti-ransomware settings and unblock or allow soffice.bin. See also Defender Controlled folder Access