https://spacedock.info/pack/417/Tower%27s%20Planet%20Pack%20Collection%20for%201.12.3
WARNING, DO NOT DOWNLOAD ALL OF THE MODS IF YOU HAVE WEAK PC, IT COULD CRASH YOU
This pack adds much of planet's for kerbal space program, every of them tested byself so there won't be many problems with bugs(i think)
I'm not respond for your saves, i recommended to start a new one just to be safe
Some mods of this pack you need to install by yourself like "Outer Planets Mod" Here's link for it https://forum.kerbalspaceprogram.com/index.php?/topic/184789-131-111x-outer-planets-mod-v229-12th-feb-2021/
And also i recommended to read description of these mods to see known issues or needed mods for it
Features
*Adds Erruel star sytem
*Adds 2 star type system (Flamed out mod, also remove EVE folder IMPORTANT!!!)
*Adds planet Deturpant as a new gas giant
*Adds Muniant as a new planet
*Adds Helvica as a new gas giant
*Adds Heracleitus for Kerbin as a moon
*Adds Ghekta as a new planet (just copy files from ZIP file into GameData !!!IMPORTANT)
*Adds Salus as a new gas giant
*Adds Corelian as a new home for Dres
*Adds Minor Planets Expansion
*Adds Outer Planets Mod
Installation
Changelog 3
*Added Erruel Star System
*Added Flamed Out mod
Changelog 2
*Added planet Deturpant as a new gas giant
Changelog 1
*Added Helvica as a new gas giant
*Added Muniant as a new planet