What does 'deprecated' mean, as used in the following wording taken from
https://www.nem.io/install.html:
NCC/NIS Installer (Deprecated)
The original NCC/NIS Installer. We suggest using Nanowallet, or NCC/NIS Standalone instead.
And why are the Nanowallet and NCC/NIS Standalone considered to better alternatives to the original NCC/NIS Installer?
Thanks in advance for any replies

NanoWallet is developed with a newer and better technology. NCC is therefore considered to be the 'old' wallet. Deprecated indicates that at some point it will be replaced.
There were some difficulties with the zip file i remember. I'm not sure why the installer is not recommended as alternative.