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With the last upgrade of Illustrator CC the horizontal type on a path option has disappeared. Only the vertical option is available.
You can try and configure the tools panel.
Or just select Window > Tools > Advanced
Thanks for reaching out. In addition to the response given earlier, I'd also request you to check out this help article(https://helpx.adobe.com/in/illustrator/using/tools.html) to know more about managing tools in Adobe Illustrator.
Hope it helps.