The R package gnumeric requires an external program,
ssconvert (normally installed as part of the spreadsheet
application gnumeric) in PATH.
The last release of the gnumeric application for windows
is 1.12.17 from 2014.
The page https://www.cyberithub.com/how-to-install-gnumeric-ssconvert-on-windows-10-using-2-methods/ suggests
Either
choco install gnumericsetx /M path "%path%;C:\Program Files (x86)\Gnumeric\1.12.17\bin"Or
C:\Program Files (x86)\Gnumeric\1.12.17\bin) to the
environment variable PATHBoth https://command-not-found.com/ssconvert and https://formulae.brew.sh/formula/gnumeric suggest
brew. See https://brew.sh/brew install gnumericUse the systems package manager to install the package
gnumeric (On Fedora: gnumeric-1).