This is a duplicate of R-devel-el-capitan-signed.pkg fails to download when testing on R devel.
Indeed, ignoring the combination MAC + R-devel was the recommendation from @jeroen in that issue.
This is a duplicate of R-devel-el-capitan-signed.pkg fails to download when testing on R devel.
Indeed, ignoring the combination MAC + R-devel was the recommendation from @jeroen in that issue.