If nothing comes down from the dropdown (look for sandbox) and you hadn´t had the launcher open the whole time but opened it after you installed it into the MnB modules folder (in order to update the dropdown list) it could be very well indeed that you didn´t extract it into the proper folder at all.
So go check your MnB modules folder wether or not it contains the folders named after the module you want to install. In PoP 2.05´s case, that´s a folder called "sandbox". And that folder should have all the information and data it needs. If it contains nothing but another single folder, just shift all the content up one branch and you´ll have your mod in the list if you update the launcher (close, open).
If it isn´t there, your Microsh!t software installed it somewhere else, so you need to track it down, delete the files (clean HDD and more space) and unpack it into the proper MnB module folder and not into your download section or anywhere else your zip program want´s to put files by default.
So go check your MnB modules folder wether or not it contains the folders named after the module you want to install. In PoP 2.05´s case, that´s a folder called "sandbox". And that folder should have all the information and data it needs. If it contains nothing but another single folder, just shift all the content up one branch and you´ll have your mod in the list if you update the launcher (close, open).
If it isn´t there, your Microsh!t software installed it somewhere else, so you need to track it down, delete the files (clean HDD and more space) and unpack it into the proper MnB module folder and not into your download section or anywhere else your zip program want´s to put files by default.