How do you use multiple versions of the same R package?

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You could selectively alter the library path. For complete transparency, keep both out of your usual path and then do

 library(foo, lib.loc="~/dev/foo/v1")    ## loads v1

and 

 library(foo, lib.loc="~/dev/foo/v2")    ## loads v2

The same works for install.packages(), of course. All these commands have a number of arguments, so the hooks you aim for may already be present. So don’t look at changing R_HOME, rather look at help(install.packages) (assuming you install from source).

But AFAIK you cannot load the same package twice under the same name.

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