Hi,
I wanted to give you (and anyone else reading this) a little info (or two):
As others have already written, it's always a good idea to make a backup of the savegame before you edit it. The easiest way to do this is to copy the folder "NMS" under Appdata\Roaming\HelloGames\. Then you have a direct copy of all game saves.
If you start a new game since the "NextGen" update, you don't need to edit the save files anymore to change the "ShpTier" and "ShopNumber" values. Since NextGen HelloGames have finally reacted and introduced the changes "ShopTier" and "ShopNumber", so that you can also buy items like the "Living Egg" etc. as an offline player.
If you play an older version, you can use my mod "OfflineShop", which automatically changes the "ShopTier" and "ShopNumber" entries to a newer version when you create a new game state.
https://www.nexusmods.com/nomanssky/mods/1782 The only problem is to get "Quicksilver". The safest variant is my mod:
https://www.nexusmods.com/nomanssky/mods/1814 This mod adds a 20% chance to normal Nexus missions to give Quicksilver as a reward. In addition, you can collect Quicksilver in every DerelictFreigher, just like at the time of the "Halloween" update.
If you want to play the daily quests from the Nexus, you can't avoid editing the saves. These cannot be made available via mod (so far).
I will always prefer the Quicksilver mod and update it as soon as possible if there is a new No Man's Sky update. At least until HelloGames itself has built a solution for us offline players ;)
See you in space!
~AlpakaDream