Mac OS Catalina not Downloading

I have re installed my mac to fresh El Capitan on my MacBook Pro. Now at the app store it is showing the Catalina version Updates but when I click on Download nothing is happening. I have previously used it but since after the fresh installation download is not working. How can I fix it? After clicking the download button, the download button fades like this but nothing is happening. Internet is working properly as well.

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Solution 1:

I managed to install it by first upgrading it to Mojave then able to download and install the Catalina.