I've downloaded the ComplexHeatmap function many of times before, but this is the first time I've seen this error message. It comes up after I try the following code, then try running the library command. R version is 4.0.0.

if (!require("BiocManager", quietly = TRUE))
  install.packages("BiocManager")

BiocManager::install("ComplexHeatmap", force = TRUE)

install.packages('modeltools')

> library(ComplexHeatmap)

Error: package or namespace load failed for ‘ComplexHeatmap’:
 .onLoad failed in loadNamespace() for 'Cairo', details:
  call: inDL(x, as.logical(local), as.logical(now), ...)
  error: unable to load shared object 'C:/Users/nathan.laspina/Documents/R/win-library/4.0/Cairo/libs/x64/Cairo.dll':
  LoadLibrary failure:  The specified procedure could not be found.
In addition: Warning message:
package ‘ComplexHeatmap’ was built under R version 4.0.3 

It seems like it just got saved to the wrong place, how can I change that location?

>BiocManager::install("ComplexHeatmap", force = TRUE)

'getOption("repos")' replaces Bioconductor standard repositories, see '?repositories' for details

replacement repositories:
    CRAN: https://cran.rstudio.com/

Bioconductor version 3.12 (BiocManager 1.30.18), R 4.0.0 (2020-04-24)
Installing package(s) 'ComplexHeatmap'
trying URL 'https://bioconductor.org/packages/3.12/bioc/bin/windows/contrib/4.0/ComplexHeatmap_2.6.2.zip'
Content type 'application/zip' length 3286900 bytes (3.1 MB)
downloaded 3.1 MB

package ‘ComplexHeatmap’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
    C:\Users\...\AppData\Local\Temp\1\RtmpWwrYJX\downloaded_packages
Installation paths not writeable, unable to update packages
  path: C:/Program Files/R/R-4.0.0/library
  packages:
    boot, class, cluster, codetools, foreign, KernSmooth, lattice, MASS, Matrix, mgcv, nlme,
    nnet, rpart, spatial, survival
Old packages: 'cli', 'dbplyr', 'dplyr', 'tibble'
Update all/some/none? [a/s/n]: 

You should upgrade to R-4.2.0 and Bioc 3.15. We don't support old versions, because it's hard enough to support the release versions.

The error you are getting has nothing to do with ComplexHeatmap though - if you look closely it's complaining about not being able to load your Cairo.dll, which is part of the Cairo package, not ComplexHeatmap.

Also, unless there is something wrong with a given package, there is almost never a reason to use force = TRUE. That argument forces BiocManager::install to re-install an existing package, and if you have an existing package and it works, there is no reason to download and install it again. If that's something you do regularly, you shouldn't.