I've tried to install the RevoScaleR package within Microsoft R Open 3.5.3 but I get the message 
"package ‘RevoScaleR’ is not available (for R version 3.5.3)"
which I suppose is clear enough. Is there any way around this? Or will I just have to drop back to an earlier version of MRO to get it to work? I need to use the rxGlm() function because the standard glm() function won't cope with the data I'm working with (size and complexity).
Thanks