The RAND function returns numbers from the interval [0,1), and if you need to generate numbers from another interval, you should use the following formula: =RAND() * (bâa) + a. This will return random numbers from the interval [a,b) - greater than or equal to a, and less than b.
At the time, 5.4 was made available as a beta release alongside the stable 5.3.4 release. Now that 5.4 has become the latest stable Unity release, it seems the company intends to keep the program going a beta version of Unity 5.5 is slated to debut in the near future. source.
Eraser is available in a few flavours, the stable, the beta as well as the nightly builds. Stable builds of Eraser are builds in which few, if any, bugs remain in the code and is suitable for use in all environments. If in doubt, choose the Stable version. The beta and nightly builds cater to a slightly different audience.