How to get out of this mess, without exploding everything in my project?

With my old SKU 19 I just don’t get access to anything like the warehouse anymore at all.
As I am in the middle of my huge project for several years, call me an Artist, I don’t make a living off it ,yet who knows if I ever manage
I am VERY concerned to do anything with my SKU

Since I managed to reinstall on my newer PC I haven’t had the courage to try to reinstall all the extensions and quite some I paid for but not really need at this time
as my main project is not to learn UE 5.4 and make it a game model
I already can walk around but still have huge issues with “collisions”
But thank you VERY much for helping me

I joined some paying course for UE and Twinmotion
but once its paid the lessons are the lessons and no one
will answer specific personal questions
and when one does not have the right vocabulary its like an needle in a haystack to get answers with AI or Google etc…
I don’t have the IT lingo I design like someone who creates a painting
it goes on and one and more and more into details

In the moment I am battling to correct my water in my lake as I posted some minutes ago. I can’t delete a water surface across my yacht that I put into the scene I needs to be dry inside not with the water going through

Thank you for your kindness

You can access through the website to both warehouses, extensions a 3D models https://extensions.sketchup.com . Thomthom has also a website where you can download some of his plugins. If you go to Plugin Store Download | SketchUcation, you can download their extension warehouse and be able to download a lot of plugins directly from your version of Sketchup. Remember that you must install a Library to be able to use Thomthom plugins, its called TTLib and you install it just like any other plugin.