The recent Notepad++ x64 8.5.4 fixlet is pointing to the x86 EXE, which will not only remove an existing x64 version on a system, it will also affect any add-ons or plugins associated with it.
Correct INFO:
Q: Sha1 of file "C:\Users\jknapp\Downloads\npp.8.5.4.Installer.x64.exe"
A: b68f1e86faada9c8bea416c38a209d19eccd352d
Q: Sha256 of file "C:\Users\jknapp\Downloads\npp.8.5.4.Installer.x64.exe"
A: 1df56772594a5ec2f550c7727a4879142736106da68b5d185c4391e08b48ec5e
Q: Size of file "C:\Users\jknapp\Downloads\npp.8.5.4.Installer.x64.exe"
A: 4662072