Hello @yunis.
First of all thank you very much for buying the pro version of the theme.
At first please log in to your ThemePalace account, there you will find the zip folder of the theme that you have purchased. Download the zip file and upload in the theme folder of your WordPress setup.
Also, you will get the license in your ThemePalace account which you need to add and activate by going to Admin Panel > Appearance > Theme License.
Screenshot:
https://prnt.sc/oltgax
Hope this helps.
Let us know if you have any confusion further.
Thank you.