Hi @MahaB82A_
I know this is an older thread, but I wanted to add an update that may help new users visiting this thread. Most Helvetica fonts are now available directly in Photoshop through Adobe Fonts, so you no longer need to install them manually in many cases.
How to access them:
- Make sure you're signed in to the Creative Cloud desktop app.
- In Photoshop, open the Type menu (or the font dropdown in the Character panel) and select Find more from Adobe Fonts.
- Search for "Helvetica" and click Activate.
- The font will automatically sync and become available across your Adobe apps.
You can also browse and activate Helvetica directly here: https://fonts.adobe.com/search/fonts?query=helvetica
Hope this helps anyone who comes across this thread in the future!