Intellimouse Optical-side buttons for Catalina My ~20 year old Intellimouse Optical optical functions in Catalina.  I would like to be able to use the side-buttons to &quot;go-back&quot; in Safari.  I believe (please tell me if this not correct) that intellipoint will unlock this feature.
The instruction's step-1 calls for:
ruby -e &quot;$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)&quot; &lt; /dev/null 2&gt; /dev/null ; brew install caskroom/cask/brew-cask 2&gt; /dev/null

Step-1 seems to install brew, however, I am reluctant to execute this command because brew cask has already been used to install applications such as sublime-text.
brew cask install microsoft-office

returns the error:

Error: Cask 'microsoft-intellipoint' is unavailable: No Cask with this
name exists.

Per the comments I tried:
brew cask install caskroom/drivers/microsoft-intellipoint

Which returned:

Error: caskroom/drivers was moved. Tap homebrew/cask-drivers instead.

Is there a method to determine the cause of the error without performing Step-1?  I am concerned that Step-1 may cause problems as brew is already installed per https://brew.sh  If the fix is to perform Step-1 because it somehow adds the equivalent of a repository, I would appreciate an ELI5
Based on this thread I would like to avoid disabling the System Integrity Protection for the very old Microsoft Drivers.
I suspect the side-buttons are sending a signal and it may be possible to configure OS X per the goal.
SensibleSideButtons might help with your problem, but keep in mind it is a third-party solution, so there is a chance it won't work properly.