go to "Previous Versions" !!! But the link is wrong still. This is wrong link: https://sac.chitubox.com/software/download.do?softwareId=17839&softwareVersionId=v1.6.5&fileName=CHITUBOX64Install_1.6.5.exe and this is the correct link: https://sac.chitubox.com/software/download.do?softwareId=17839&softwareVersionId=v1.6.5&fileName=CHITUBOX64Install_V1.6.5.exe