I guess I have almost the same situation as yours (recently reinstalled mac os, hence the newest version Catalina 10.15.4) As @Mico and @egreg said, since you are 'Mac OS 10.13, High Sierra, or higher', you should choose Downloading MacTeX 2020.After downloading, open Application/Tex you will see 'MISSING APPS.pdf' where they explained due to the higher security requirement from Apple, there's. Set Texlive as the default engine in Sublime: Open package settings for LaTeXTools and search for “windows”. There are self-explained comments help you to finish the configuration. Automatic detection of MikTeX, TeX Live, Ghostscript, and Standardlatex; SVN support; Note: The OS X version is experimental. Since none of the currently active developers are using OS X, we cannot thoroughly test it. We do our best to also support OS X, but be prepared that there may be some issues. Safari (web browser) – built-in from Mac OS X 10.3, available as a separate download for Mac OS X 10.2; SeaMonkey – open source Internet application suite; Shiira – open source; Sleipnir – free, by Fenrir Inc; Tor (anonymity network) - free, open source; Torch (web browser) - free, by Torch Media Inc. Internet Explorer for Mac – free.
I found myself using the same TeX distribution for years, without updating it. This is not a problem usually, unless you are asking someone else to look at a particular error or problem and that person is working with another version and therefore may not be able to reproduce your issue. The TeX Live distribution is evolving, i.e. packages are extended, replaced or added and therefore it is a good idea to update your distribution once in a while. TUG provides an updated image every 1-2 years.
Windows:
If you have MiKTeX installed (part of proTeXt), there is a program that you can run in: All Programs -> MiKTeX -> Maintainance -> Update. This will open a dialog that helps you update the distribution.
Mac OS X:
Under Mac OS X, the TeX Live distribution is called MacTeX. It contains a neat little graphical application that lets you update your distribution. The application is called “TeX Live Utility” and can be found in Applications -> TeX. It has a built-in update function to keep the application itself up-to-date.
If you prefer the terminal, try:
Linux (Ubuntu):
It is a little tricky to update TeX Live under Linux and as usual depends on the distribution as well as your local settings. So below I describe the way I did it on my computer. Call of duty for mac download. It should at least give you an idea how to do it or what you may have missed in case you run into some problems. I am running Ubuntu.
I leave it to the reader to decide what he is more comfortable with, running commands with sudo or change the rights for the texlive directory you are updating. I will use the latter approach here. Set the username accordingly as well as the install directory if it differs.
If it has not been done before, add the install directory of the TeX Live distribution to the path. The tlmgr-command (texlive manager) is in that directory.
Next you have to set the location where you want to update from. This has to be done only the first time you are updating. In addition, you may be asked to update “tlmgr” also in case there is a newer version.
Mactex Mac Os X
and
Finally, you are ready to update the TeX Live distribution.
Mactex Texlive
This final step may take a moment, time for a coffee.