DecryptPDF v0.11 - Win
Download and extract the zip file and it's ready to run. Run the DecryptPDF.exe file.
Also, about the file size, I couldn't make it smaller because python is not installed by default on all PCs. This package contains the entire python library and other dependencies so that it can function on any PC. That's why the program is big. But I think 60MB isn't a very big file size.
*Antivirus softwares might warn you about this program since it's not signed. You don't have to worry though because it is just a false positive. This program is completely safe to use.