When placing a tower there will be a menu that pops up asking you to choose a path. Most of the time you tend to quickly ESC it away. Do not do this but rather click on the second (right) option. This will set the tower to the correct path and let you upgrade using the bottom path.
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I was going through my old “suggestion archives” and found my old “Outer Space Bundle” suggestion that I had made before the Galaxy Bundle was ever announced.
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