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Hi,
Would you please help,

If I got a Landing page template or Thank You page template which contains of :
- html page file
- css file
- images folder

How to insert this one page into wordpress and keep it's design the same without any problems, and how can I import these files into for example Instabuilder or profit builder or optimizepress.

Please help
Thanks

You must create a custom template page : https://codex.wordpress.org/Pages#Creati..._Templates

If you are not familiar with coding, I suggest you to build your landing page with a plugin or just put your html files on the server and use an absolute link.