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My sister's Mac is old! Can anyone here point her to a version of TextMaker that will work with MacOS 10.11 El Capitan? Many thanks.

Using FreeOffice TextMaker 2018 (rev 973.1103) 64bit. Notice for downloading new service pack shows up, so I download FreeOffice 2018 for Mac. Installation starts and proceeds, but repeatedly fails. This is NOT Apple refusing to install. It is a window that reads: "An error occurs during instal...