在Windows上安装软件包devtools和caller时出现问题

安装软件包 devtools 我收到以下消息

Installing package devtools I obtained the following message

There are binary versions available but the source versions are later:
         binary source needs_compilation
processx  3.3.1  3.4.0              TRUE
callr     3.2.0  3.3.0             FALSE

此外：

* installing *source* package 'callr' ...
** package 'callr' successfully unpacked and MD5 sums checked
** using staged installation
** R
** inst
** byte-compile and prepare package for lazy loading
Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = 
vI[[j]]) : 
namespace 'processx' 3.3.1 is being loaded, but >= 3.4.0 is required

和

ERROR: lazy loading failed for package 'callr'
* removing 'C:/Users/Standard/Documents/R/win-library/3.6/callr'
Warning in install.packages :
installation of package ‘callr’ had non-zero exit status

然后我尝试了更新 processx 包，希望它可以解决问题：

Then I tried to update processx package, hoping that it could fix the problem:

install.packages("processx")
library(processx)

RStudio要求我重新启动R会话，然后

RStudio asked me to restart R session but then

> install.packages("devtools")
ERROR: lazy loading failed for package 'callr'
* removing 'C:/Users/Standard/Documents/R/win-library/3.6/callr'
Warning in install.packages :
installation of package ‘callr’ had non-zero exit status

我在做什么错了？

编辑我尝试安装 processx 和 caller 及其依赖关系

EDIT I tried with installing processx and callr with their dependencies in this way

install.packages("processx", dependencies=TRUE)
library(processx)
install.packages("callr", dependencies=TRUE)
library(callr)

，但我收到消息：

Error in library(callr) : there is no package called ‘callr’