I just downloaded this program. After few seconds of work it stopped working "Not responding"

After few minutes it works again and then stops again - endlessly! What can I do?

Update: I tried to uninstall the program, but I get note: “Windows cannot access the specific device, path, or file. You may not have the appropriate permission to access the item”. Any advice? Thanks!

Have you the good privileges ? Are you administrator whith your account or could you use the administrator account ?

Maybe you should reboot your PC, uninstall LibreOffice, take the latest stable version 5.3.6:
install and enjoy it!