Checking the currently installed version of Fusebill's Salesforce managed package.

In Salesforce, navigate to your Setup page.

In Lightning:

In the left-side navigation panel, go to "Installed Packages" this can be done using the search at the top, or by navigating to Apps, Packaging, Installed Packages.

In Classic:

In the left navigation panel, go to "Installed Packages" this can be done using the search at the top, or by navigating to the Build section, and then Installed packages.