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Hi Spyros,
Good day. The error in the screenshot is 30183-28 (400). This usually means Office can't download one or more files needed for the language installation. Microsoft specifically lists network, firewall, antivirus, proxy, or a problem with the online installer as common causes.
I would avoid repeatedly clicking Install available in Word. Instead, install Greek using Microsoft's Language Accessory Pack directly:
- Open Microsoft's Language Accessory Pack for Microsoft 365 page:
https://support.microsoft.com/en-us/office/languages/language-accessory-pack-for-microsoft-365? - Find Greek.
- Download the 32-bit or 64-bit version that matches your Office installation.
- Close Word and the other Office apps.
- Run the downloaded installer and let it complete.
- Reopen Word > File > Options > Language.
- Under Office display language, select Greek and choose Set as Preferred.
- Restart Word.
Greek is fully supported and the language pack includes the display language, Help, and proofing tools.
If the standalone installer gives the same 30183-28 error, temporarily check whether your antivirus, firewall or a proxy is blocking the download. Microsoft also recommends trying a wired connection or the Office offline installer when this error occurs.
I hope this helps.
Regards,
Jhun