It is a multivolume self extracting .rar file, so...
Download all 6 parts of 2.370 to the same folder.
Then run part 1.
Code:
\SB Beta 560,495,685 File Folder
SBProPEB2_370.part1.exe 100,050,165 Application
SBProPEB2_370.part2.rar 100,000,000 WinRAR archive
SBProPEB2_370.part3.rar 100,000,000 WinRAR archive
SBProPEB2_370.part4.rar 100,000,000 WinRAR archive
SBProPEB2_370.part5.rar 100,000,000 WinRAR archive
SBProPEB2_370.part6.rar 60,445,520 WinRAR archive
\SB Beta 560,495,685 << Total Dir Size
File Sizes in Bytes
Release Notes:
http://www.steelbeasts.com/updates/SBProPE_Release_Notes.pdf
Files on the eSimGames web page. These require your dongle/license for use, but not for installation.
SBProPEB2_370.part1.exe
SBProPEB2_370.part2.rar
SBProPEB2_370.part3.rar
SBProPEB2_370.part4.rar
SBProPEB2_370.part5.rar
SBProPEB2_370.part6.rar