CLDR Package

Hello,

How to Install the CLDR package in 4.5 and where I can find this?

Do you mean CLDR Package, or "Language Pack" (for nopC string resources)?
https://docs.nopcommerce.com/en/getting-started/advanced-configuration/localization.html

Yes, I Checked it but in the Language culture dropdown, there are only three values how to add other Language cultures To this?

Are you referring to this "Language culture dropdown"?

https://docs.nopcommerce.com/en/getting-started/advanced-configuration/localization.html

I can confirm in 4.60.3 (docker based) I can only select one of three language culture options, using the Language Culture dropdown in the Language edit screen:
en-us
en-gb
en-001

The solution to this issue was found by FrankHFS in his forum thread.