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I have R version 2.10 installed (from an RPM) on a RHEL 5 machine. What would be the easiest way to downgrade to version 2.8?

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up vote 0 down vote accepted

Get the RPM file and do

rpm -Uvh --oldpackage r-package-file-2.08.architecture.rpm

There may be endless complications if the older package is for an earlier distro and has (ugh!) dependencies, but as long as it's just an earlier version for RHEL5, you should be OK.

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