Hello AmolG;

Siemens defines "options" as additional software that is not included in the main package you have purchased.

So if you have a license for WebUX v15, you can use your new TIA Portal v16 license and continue using it.

See this Product Note for more details:

https://support.industry.siemens.com/cs/ww/en/view/109771626

Hope this helps,

Daniel Chartier