It can be found as DLC for the game on the Steam Store: NEKOPARA Vol.2 - 18+ Adult Only Content
If the Steam Store page isn't working, you may be able to install it by either clicking the following command or running it directly on your PC: steam://run/947660
Note that this will immediately run the game and start downloading the DLC if possible - you may need to close the game and wait until the DLC finishes downloading for the patch to work.
There is a patch available, but it has to be purchased. It can be bought through Steam or from the developers website, or through DLsite.
Run the patcher provided by Denpasoft after purchase, and follow the prompts.
When you go to the Config menu and then the Effect&Sound screen, in the Effects Settings box, there is a "Turn H-Animation On" checkbox.
Patch download: https://denpasoft.com/products/nekopara-vol-2-18-dlc?rfsn=2373751.64f308&utm_source=refersion&utm_medium=affiliate&utm_campaign=2373751.64f308
Steam store: https://store.steampowered.com/app/420110
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