The FDOT Civil 3D 2019 State Kit was released on October 1, 2018. This is the third Maintenance Release for this product, however the description on the FDOT web site is incorrect and should read as follows:
This is the install file for the third [Maintenance] release of the FDOT2019 Civil 3D State kit Software.
FDOT2019 C3D & AutoCAD State Kit Release, (version 01.03.00) is now available.
This Maintenance Release contains file changes, new files and Application Enhancements that have occurred since FDOT2019 C3D & AutoCAD State Kit MR2 was released on 04/03/2019.
Below is the link for the FDOT2019 Civil 3D State Kit MR2 and Installation Guide.
At this time there is no link to the Release Notes on the web site. The 2 page document can be found after you install at C:\FDOT2019.C3D\FDOTC3D2019-MR3ReleaseNotes.pdf .
The Installation Guide recommends you read that entire document before you install. I also recommend you do so. It has useful information that can save you some trouble. For instance, you must uninstall the FDOT Civil 3D 2019 State Kit before installing MR3.
As a best practice find and install the updates to AutoCAD 2019, AutoCAD Map 3D 2019, and AutoCAD Civil 3D 2019 before installing FDOT2019 Civil 3D State Kit MR3. Updates can and often do get installed after the FDOT Civil 3D 2019 State Kit is installed without any problems.
Please review my guide to Autodesk Software Updates (published in a mind map format). This guide provides the necessary information required to navigate the overly complex process of finding and installing Autodesk software updates.