https://en.numista.com/forum/topic10147.html#p63138
https://en.numista.com/forum/topic28757.html#p239712
It is a free download.
Will add in a moment the part I used last night to add and rotate text (never done that before). I also remember a few months ago a great-looking program that can crop odd shapes (such as a flower) which would be good for 7-sided or scalloped coins, for example. Will see if I can find that as well.
Yes, found it - looks impressive, though so far not used it or needed to ...
https://en.numista.com/forum/topic28635.html#p238814

I recreate today what I used last night - hopefully all can be explained with the one screenshot. Open the PhotoScape program and click on Editor. On the top left pane select on your computer where the image you wish to work on is located; it will be shown large on the right-hand pane. Then of the four tabs Home/Object/Crop/Tools go to Object and select the letter T icon for adding text. The box called Text appears over the other panes, while the desired text details are being selected; I show the capital letter I selected, in red colour, in Tahoma font, and many other parts I did not use. On top of the large image is a box with dotted border in which the letter is shown; and above is a two-way arrow which is for rotating the letter to any degree, and the box itself can be dragged anywhere over the image.
All sounds a bit complicated but it is easy!
The jeton, by the way, does sometimes have normal words and sometimes nonsense lettering - so may not be decipherable. Still would be nice to find an example with same lettering recorded somewhere, if only to see what the unknown letters are.