I get the message “Installation package could not be opened. Contact your vendor to verify that this is a valid package” when trying to install the new 6.3.6 on BOTH of my Dell machines. #1 Windows 10 PC 32 bit and #2 Windows 7 laptop 32 bit. They have Libreoffice 5.3. and 6.3.5 respectively on them now. I went to the list of older versions but there is nothing there to download! just dates of when they came out. I have lost the initial installation download so I have no working Libreoffice. Help.
I went to the list of older versions but there is nothing there to download! just dates of when they came out
I don’t understand this statement. LibreOffice Archive at Index of /libreoffice/old delivers (almost?) everything ever released. Just click on the versions numbers and you could select your operating system and and bitness (subdir ./win/x86 = 32-bit versions for Windows)
Latest 5.3 - 32 bit: https://downloadarchive.documentfoundation.org/libreoffice/old/5.3.7.2/win/x86/LibreOffice_5.3.7.2_Win_x86.msi
6.3.5 - 32-bit: https://downloadarchive.documentfoundation.org/libreoffice/old/6.3.5.2/win/x86/LibreOffice_6.3.5.2_Win_x86.msi
I click on of those links and I get this: link text It is just dates when modified…NOTHING opens to download any choice of OS.
I downloaded the older versions from your links: They also return the message: “Installation package could not be opened. Contact our vendor to verify this is a valid package”. EDIT: Third time is the charm. This time I DID get 6.3.5 - 32-bit to open and install. Thank you very much for the link. I still dont know why I could not get the download link. 
Either you had incomplete downloads or your browser is broken, or both (along with some odd behaviour you described seeing only a date). And no, I’m not going to view your link text file on a Google drive that wants me to login.
Wow touchy. Here is another link to a Google photo page instead of the Google Drive. Sorry I did not know it would ask for any ID info. https://photos.app.goo.gl/54Ayh2pkp6rGDgZE6
It’s not only dates, it’s a directory listing along with date of last modification (of that directory). The {deb,mac,rpm,src,win}/ are clickable links, as you are on Windows you’d choose win/ and within there x86/ for the 32-bit version.