The simplest way to manage installation and upgrades is to install the managed package to a sandbox or production org from the AppExchange listing: https://appexchange.salesforce.com/appxListingDetail?listingId=a0N3A00000FR5TCUA1
When installing, it's recommended that you give access to only to System Administrators. This allows access to FormulaShare configuration and logging information to be controlled by permission set, which supports a more flexible permissions model.
The source code and all metadata configuration for FormulaShare is available on Github. Deploying to an org from files on Github is also possible, though out of scope of this guide.