If not, or if the package is not up-to-date with the latest Mantis BT version, then you may want to download it directly from here.
For Windows, Mac OS X and other operating systems, use the link provided above to download Mantis BT. Both formats can be unpacked using tools like 7-Zip (in case of Windows).
Note that at any point in time there are typically two "latest" Mantis BT releases that are available for download.
The latest production release (stable), and the latest development release which can be an alpha or a release candidate.
Using the current date in the filename can prevent overwriting and make cataloguing easier.
In Mantis BT, there is no limit on the number of user accounts that can be created.
Quickly ruled out were php*Something* names which, incidentally, although popular, do not seem to be condoned by the PHP Group developers.
They are extremely desirable in agriculture as they devour insects that feed on crops. So, we have a name that is fairly distinctive and descriptive in multiple ways.
The BT suffix stands for "Bug Tracker" and distinguishes this project from general usage of the word Mantis.
Mantis BT, as a PHP script, can run on any operating system that is supported by PHP and has support for one of the DBMSes that are supported.
Mantis BT is known to run fine on Windows, Linux, OS/2, Mac OS X, System i and a variety of Unix operating systems.