I can’t install liberoffice 6.2.8 because I get a notice that intro.png file is missing from libreoffice1.cab.
How do I fix this problem? Can I locate the liberoffice cabinet folder and fix it? Please advise.
Most likely you need to download the installer again.
However, first reboot and see whether any updates need finishing. Pending/unfinished Windows updates sometimes make other software give strange/misleading error messages. If your computer indicates that the reboot will finish an update, you may not need a new download.