Protect the baseline
Launch the unmodified game once, back up local saves and settings, verify the game version, and record the clean folder location.
Mods can change visuals, interfaces, vehicles, worlds, rules, and complete play styles. The safe approach is not to install everything at once. Protect the clean game, understand every dependency, and build a setup you can reverse.
Launch the unmodified game once, back up local saves and settings, verify the game version, and record the clean folder location.
Read the author's instructions, install one mod or dependency at a time, then test the same save or scene before adding another.
Record the mod name, source, version, files changed, requirements, and removal steps. Keep downloaded archives only when you trust their origin.
Rockstar Support: PC single-player mods policy
Hello Games: No Man's Sky release log