Can't install packages

Installation
1

Hello guys, I’m novice for R and I already downloaded R and Rstudio.
Then I tried to install igraph and ggplot2 however I couldn’t do.
Currently I use Windows 10 and R 4.0.2

install.packages(“igraph”)
Warning in install.packages :
unable to access index for repository https://ftp.acc.umu.se/mirror/CRAN/src/contrib:

WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

Installing package into ‘C:/Users/Tsubasa/Documents/R/win-library/4.0’
(as ‘lib’ is unspecified)
Warning in install.packages :
unable to access index for repository https://ftp.acc.umu.se/mirror/CRAN/src/contrib:

Warning in install.packages :
package ‘igraph’ is not available (for R version 4.0.2)
Warning in install.packages :
unable to access index for repository

It’s showed like this.
I want someone to help me with this problem.

Thank you

2

There was just a new release of igraph for R (1.2.6), for which the Windows binaries were probably not yet available. They now seem to be available, you should be able to install them now.

3

Thank you for your comment. But I can’t still install igraph.
I tried to uninstall R and Rstudio but it didn’t work.

I’m lack of knowledge but I really need to know.
So if you can help me out, I really appreciate.

4

It looks like this may have been a temporary CRAN connection issue, and unrelated to igraph. I would expect it to have started working since then.

5

Thank you for your advise. I could deal with it! The mainly because my laptop registered Japanese user name, I couldn’t install packages.
I appreciate your support!