Dos not work with the lite version 
It should work. Did you do right?
If you are using a version prior to 2.3, remove that version and install the newer:
Same with this one when pressing CTRL+Z
@pitiwazou, I know what’s going on. You need to finalize the tool, first (LMB twice or Enter). There then press Ctrl + Z.By pressing Z while using the tool, you are enabling constrain Z.
But I’ll make some edits here to avoid this confusion.
Thanks You.
@pitiwazou, The update is now available 
. (In the first post)
The UNDO operation work while LINE tool is acting.
@pitiwazou, the update is now available . (In the first post)
The UNDO operation work while LINE tool is acting.
I updated the addon in first post. But it had a bug. Now I updated again. Those who downloaded before reading this post. Download again. Sorry.
The UNDO operation work while LINE tool is acting.
Great !! Thank you 
With the last version, my Pc crashed ! Same for a friend of mine.
REALLY!!!
I’ll fix URGENTLY IT.
EDIT:
I have found that if you draw two lines on different faces using the intersect bollean but do not intersect, this causes an infinite loop. I think this is the problem.
IMPORTANT UPDATE.
If you have one of these versions: 2.0 to 2.4. Please upgrade to version 2.6. An important bug fix was made.
ChangeLog:
2.4 - The UNDO operation work while LINE tool is acting.
2.5 - ‘location_3d_to_region_2d’ returns a Vector value if the coordinates refer to a point behind the origin of a perspective view.
2.6 - fixed pc crash when you try to split a face with a line whose previous point is not connected to faces.
The download is in the first post.
Thanks mano-wii. I dont know why but I cannot get the new version to install. It will not show up with the addons. so I installed the old one again and that one
works. So I am not able to update. Any idea what this can be?
I put the Addon on github to share updates in less time.
Anyway, download here the version 3.0 
2.7 - replaced bpy.ops.view3d.select() for bpy.ops.view3d.select_or_deselect_all(), resulting in an extensive cleanup in the code
2.9 - Replaced Unproject in face selected for ‘intersect_line_plane’ (fewer calculations and more accurate)
Great Tool! i would vote for trunk to combine it with the existing knife tool.
Anyway, thx you!
Thanks @mkbreuer :).
The 3.0 version of the addon is available. In addition to an extensive cleanup in the code and bug fixes, we have:
3.0 - Constrain related to the previous point (if it exists).
This is a good addition, since the constrain ‘shift’ can now be used to draw parallel lines.
(removed)
hi mano-wii, do you think it would be possible to add function for creating new object?
Maybe like in this script?
thanks
Yes, I can do (that script shows how to). I’ll make a version for testing and post here. If I like and have a good acceptance, will be definitive in the addon.
Here it is:
3.2.test - If have not a active object, or the active object is not in edit mode, it creates a new object.
(removed)
Hooo this is great, can you add faces ?
I think it will be really usefull in retopo to make faces.
Like this.
Maybe when pressing Shift to keep the current behavior.