@ddk: Thank you for upgrading to Pro version. The upgrade should have automatically migrated all the settings from Free to Pro unless you are using child theme. So, it seems most of the setting are changed to defaults (Slider, Promotion Headline, Featured Content).
For these options, please use Customizer (Dashboard=> Appearance=> Customize) instead Theme Options. For slider, go to Dashboard=> Appearance=> Customize=> Featured Slider=> Slider Options.
For disabling Promotion headline (Ads), go to Dashboard=> Appearance=> Customize=> Theme Options=> Promotion Headline and select Disable in
Enable Promotion Headline on drop-down option.
And removing/modifying Featured Content (mountain image), go to Dashboard=> Appearance=> Customize=> Theme Options=> Homepage Featured Content and select Disable in Enable Content drop-down option.
Hope this helps. Please follow along the theme instruction : https://catchthemes.com/theme-instructions/catch-kathmandu-pro/
Let me know if any problem.
Regards,
Mahesh