The Plus builds cannot be archived again because Plus is paid and while it's paid, re-uploading Early Access builds of Plus is not legal. And it's not a good idea to un-update from V0.3.8 back down to V0.3.2.
Viewing post in Baldi's Basics Remastered Archive comments
Added where? Also, good for you that they're saved on that drive.
EDIT: The reason why I said why un-updating from V0.3.8 back down to V0.3.2 is a bad idea is because when Witherskull42 tried to play older versions of Baldi's Basics Plus after playing newer versions of it, it didn't work.
2nd EDIT: What I said may actually have been false information. If V0.3.2 can be played again, you'd have to delete your current save file on your game window, and then quitting without creating new files by using the Windows button and then find the window close button on your screen - for your game window - simply by hovering over the opened Baldi's Basics Plus Baldi icon thing and waiting for a second for the resize duplicate render from within onto your screen that has the game open, and click the "X". A lot of us has done that too many times and it's really easy. Then, we need to open the "AppData" folder (paste "C:\Users\[Your user]\AppData\LocalLow\Basically Games") in the folder location URL input and delete & recycle the "Baldi's Basics Plus" folder that is inside of the "Basically Games" folder, in "LocalLow".