There are two basic changes that makes earlier versions incompatible with the most recent version of InForm.
One is that there is a new event called __UI_FormResized, so older code that doesn't contain a SUB __UI_FormResized will fail to compile, but the fix is as simple as adding it:
Another thing is that method SetFont has lost its last parameter. So, in your .frm file, any calls to SetFont should be changed to only contain the first two parameters: a string with the font name and the desired font size. The last parameter specifying attributes has been dropped.
These two changes are enough for your previous creations with InForm to be able to be compiled with the latest version and make use of the recent improvements.
Thanks for reposting these here.