distribute Letters (they're paths) along curved path

Marcel, Hi.

I’m working with Live Type

With Text Tool, set your type. Now Fill it with color none.

Open up your Appearance Panel

Switch to the Selection Tool.

In the Appearance Panel, Fly out menu, Add Three new Fills

Yellow color on top, then Black, then red.

Give The black and red fills a slight offset. (Effects>Path>Offset )

Create a Graphic Style.

Draw your arc.

With Text tool, copy your text.

With Text on Path tool, paste your text on that arc.

With Selection Tool, apply your Graphic Style.

Since your text is still live, tweak your tracking and kerning as needed.

K

Marcel,

Always keep a copy of the original artwork (both letters and path) as a backup.

Given what you have, you can use a really silly way, the 1 step blend fake, with full accuracy/no need to (re)position/other adjustments:

0) Make sure that the letters are abpve the path in the stacking order, as seen in the expanded Layer in the Layers panel;
1) Object>Blend>Blend Options with Spacing set to Specified Steps = 1 and Orientation set to Align to Path;
2) Object>Blend>Make;

3) ShiftClick the and Object>Blend>Replace Spine, this will give you some crippled intermediate letters, but only temporarily:
4) Object>Blend>Expand and Ungroup;
5) Delete all the crippled intermediate letters. you can do that in the L<ayers panel.