Here's whatsnew for 1.0.1:
The original 1.0.0 release had a bug that resulted in the shift keys not working correctly on Windows. For this reason, the Win32 installer and the source package have been replaced with new, fixed ones (having a version number of 1.0.0.1).

Here's whatsnew for 1.0.2:
This update fixes glBlendColor() calls with incorrect calling convention on Win32, which could result in crashes in OpenGL mode. Other platforms are not affected by this issue.

Get it here:
http://sourceforge.net/projects/plus4emu/

-Trebor