I am not the original reporter of this issue, but I too had reproduced it. Then “fixed” it. It is (at least on my end) a total user error or limitation of the plugin not being able to be added to the UE 5.6 “Engine” version, whereas it can be added to a project created within the UE 5.6 version.
With a freshly installed version of the UE, without having ever launched or created a project first, attempting to add the plugin from Epic Library will not work (see issue description below). Once there’s a project to choose from then I am able to add it to “5.6”. Profit.
This didn’t occur with another plugin (not sure if should mention it here, so I won’t), but just worth a mention. The ‘other plugin’ allowed me to just install the plugin to my version of UE 5.6 (without having any project first). A drop-down selector would allow the user to choose which engine version they want to add the plugin to.
The issue was:
User cannot add Fluid Flux asset to the Project after clicking ‘Add To Project’ from ones’ Epic Game Library.
When clicking ‘Add To Project’ from the Epic Game Library, the subsequent window prompts the user to, ‘Select the Project to Add the Asset to’. Searching projects in the ‘Search Projects’ input field returns nothing. Clicking ‘Show All Projects’ displays nothings. It only displays ‘No compatible user projects found’.
The button beneath, ‘Add to Project’ is grayed out/unselectable. And the only other option is to ‘Don’t Add’.
Previously, due to necessity, I had:
Uninstalled all previous UE engines, plugins, projects, etc (fresh/clean).