How to update and extend Gimp 2.10.10

[Gjmpw]

I’m using Gimp 2.10.10 in Windows 10.

Now the last version is 2.10.12,so I have to update.

I’m a beginner and would like to enrich Gimp with “Resynthesizer” and watercolor brushes,for example.

Can anyone tell me where I can find extensions for Gimp? with some descriptions, because
I did several searches but I didn’t find much

I read that "Registry" existed long ago, but it no longer exists.

I found G'MIC, but I don't know what it contains.

Someone recommended Partha's version to me, but I don’t know what it contains and I read the "Installation instructions" and I have doubts.

For example:

1. Do I need to uninstall the .10 version before installing the latest .12?
   
2. The computer can ask me for the administrator's password, I don't know where to find it
   
3. Delete all the Gimp references from the registry, I don't know how to do
   
4. Use Windows to associate this version with the desired image formats, I wouldn't know how to do it.
   

Please, someone can help me clarify my doubts and suggest a way to enrich Gimp 2.10.12

Thank you