Hi Leonel...

Its not only about R version, you have to use the appropriate package.

Take this link:

https://bioconductor.org/packages/release/bioc/html/SNPRelate.html

Best luck.

download your PCAdapt from https://cran.r-project.org/src/contrib/Archive/pcadapt/pcadapt_4.0.1.tar.gz

install from source in RStudio - install.packages("~/Desktop/pcadapt_4.0.1.tar.gz", repos = NULL, type = "source")

If ERROR - install the dependencies packages [it may differ according to your system]

ERROR: dependencies ‘plotly’, ‘vcfR’ are not available for package ‘pcadapt’

* removing ‘/home/abhi/R/x86_64-pc-linux-gnu-library/3.4/pcadapt’, install the dependencies packages

install.packages("plotly")

install.packages("vcfR")

install.packages("~/Desktop/pcadapt_4.0.1.tar.gz", repos = NULL, type = "source")

install.packages("robust")

install.packages("RSpectra", dependencies=TRUE, INSTALL_opts = c('--no-lock'))

install.packages("httr")

install.packages("curl")

install.packages("~/Desktop/pcadapt_4.0.1.tar.gz", repos = NULL, type = "source")

package_version(pcadapt())

#This is a shiny based app, you need to install some shiny packages according to ERROR

#shiny

install.packages("rjson")

install.packages("shinyAce")

install.packages("shinyBS")

install.packages("shinydashboard")

package_version(pcadapt())

#The shiny app could now run the PCAdapt

thanks for sharing the information