R package not compatible with 3.5.3 - r

Question

I am attempting to install a package that was made on my computer, but I am having issues. Installing seemed to work fine, but I got a warning:
Warning in install.packages :
package ‘abcmlr’ is not available (for R version 3.5.3)
This naturally throws the error when calling library
Error in library(abcmlr) : 'abcmlr' Not a valid package that has already been installed
Using .libPaths() returns "C:/Users/amlut/Documents/R/win-library/3.5" "C:/Program Files/R/R-3.5.3/library". So I presume this is why library() is giving me an error.
Why does installing my package not work for version 3.5.3 (Does this question require additional information about my package)? Is it possible to make my package work for 3.5.3? What steps would be required to achieve this?
Thank you.
Edit: this is a package I made, and I am using devtools::install
DESCRIPTION:
Package: abcmlr
Type: Package
Title: Analysis of Bone Counts by Maximum Likelihood
Version: 0.1.0
Author:
Maintainer:
Description: See Rogers ABCML for details
License:
Encoding: UTF-8
LazyData: true
NeedsCompilation: no
Packaged: 2019-06-14 21:17:42 UTC; amlut
Built: R 3.5.3; ; 2019-06-14 21:17:43 UTC; windows
Output from devtools::install:
devtools::install("C:/Users/amlut/Documents/R/win-library/3.5/abcmlr")
WARNING: Rtools is required to build R packages, but the version of Rtools previously installed in C:/Rtools has been deleted.
Please download and install Rtools 3.5 from http://cran.r-project.org/bin/windows/Rtools/.
√ checking for file 'C:\Users\amlut\Documents\R\win-library\3.5\abcmlr/DESCRIPTION' ...
- preparing 'abcmlr':
√ checking DESCRIPTION meta-information ...
- checking for LF line-endings in source and make files and shell scripts
- checking for empty or unneeded directories
Removed empty directory 'abcmlr/man'
- building 'abcmlr_0.1.0.tar.gz'
Running "C:/PROGRA~1/R/R-35~1.3/bin/x64/Rcmd.exe" INSTALL "C:\Users\amlut\AppData\Local\Temp\RtmpGySaDj/abcmlr_0.1.0.tar.gz" --install-tests
* installing to library 'C:/Users/amlut/Documents/R/win-library/3.5'
* installing *source* package 'abcmlr' ...
** R
** byte-compile and prepare package for lazy loading
No man pages found in package ** help
'abcmlr'
*** installing help indices
** building package indices
** testing if installed package can be loaded
*** arch - i386
*** arch - x64
* DONE (abcmlr)
In R CMD INSTALL
library(abcmlr)