This isn't the solution, but are you using R 3.4.* for a reason? If not, you should consider upgrading (the current version is 3.6.2). The 3.5 upgrade was a major change, so you will need to reinstall packages, but it will be worth it moving forward.
Now, onto the output you pasted:
There are a few problems going on there, the first of which is that your system is unable to move some packages to their proper destination, e.g.:
Warning in install.packages :
unable to move temporary installation ‘C:\Users\MEMolina\Documents\R\win-library\3.4\file27506368d96\processx’ to ‘C:\Users\MEMolina\Documents\R\win-library\3.4\processx’
There could be several reasons for this, but we'll need some system information to help you troubleshoot (see my answer from another question, below, and the linked StackOverflow thread)
Later in the error message, you seem to have an internet connectivity issue:
trying URL 'https://cran.rstudio.com/src/contrib/BH_1.72.0-3.tar.gz'
Warning in install.packages :
InternetOpenUrl failed: 'The operation timed out'
Error in download.file(url, destfile, method, mode = "wb", ...) :
cannot open URL 'https://cran.rstudio.com/src/contrib/BH_1.72.0-3.tar.gz'
Warning in install.packages :
download of package ‘BH’ failed
I'm not sure why exactly this would occur, but both issues mean that you subsequently can't install packages that depend on packages that failed to install. For example:
ERROR: dependency 'processx' is not available for package 'callr'
* removing 'C:/Users/MEMolina/Documents/R/win-library/3.4/callr'
Because processx didn't end up in your library, you can't install callr, which depends on processx.