You will need administrative privileges when running the program for the first time after upgrading (in Windows Vista, 7 and 8 use Run as administrator).
Changes in this version include:
Resource files (e.g. bitmaps and music) can be embedded in the compiled EXE and are automatically extracted when the program is run. This can let you package your application as a single file without needing an installer.
The TEXTEDITOR control now has Find/Replace facilities, available in the Edit menu, the right-click context menu or by typing Ctrl+F.
The LISTBOX control now supports a horizontal scroll bar. Unlike in LB 4.04 this works correctly even if you change the font size.
The limit on the total number of windows, controls and sprites has been increased to more than 2000.
Many more Windows Constants are now recognised.
A few other minor compatibility issues have been addressed.Richard.