Hello all! first off thank you for the time you spend sharing thoughts, opinions and ideas!
I have tried a few searches for this particular question but not too extensive so sorry if it is somewhere else. 
Using the free trial program I had zero issues, so I paid for the general/private use license key.
Now I cannot seem to import any photos into the LRTimelapse4. 
I have yet to try from card, as all my files are currently on my macbook. 
I have tried exporting from lightroom into a folder on desktop then from desktop to LRtimelapse4, however the folders are always Grey and unselectable. Any ideas please?

Update- I think I fixed my issue, It was exporting files as .TIFF and I suppose that is something LRT can't accept...yet?
Who knows, I will find out eventually.

LRTimelapse does not support Tiff, you are right.
But maybe you have a misunderstanding about the workflow of LRTimelapse: normally you don't use it on already exported images, you use it on the original RAW files and all the editing hill happen on metadata-basis. Please give my tutorials a look: http://lrtimelapse.com/tutorial

Does that mean that LRT will not work on jpg files?

Sure it supports jpgs, but normally this will be the original jpgs then and not already processed ones.