Talk:A&G Construction/@comment-180.191.79.204-20180708122609/@comment-35819953-20180708151109

It sounds as if you're playing the free demo, upgrading the assembly station and worktable is not possible in the free demo.

If you've paid for the game on Steam, the option should be available when you go to A&G Construction -> select the book on the desk -> click the worktable in the left-hand list of buildings in your workshop -> select the upgrade button in the lower part of your screen.

You must carry all items necessary for the upgrade in your inventory, in order to buy the upgrade.