Anyway, I hope the author can be a bit more specific about what actually has happened to those unlucky enough to have received these malicious updates. And perhaps a tool to e.g. do a checksum of all Notepad++ files, and compare them to the ones of a verified clean install of the user's installed version, would be a start? Though I would assume these malicious updates would be clever enough to rather have dropped and executed additional files, rather than doing something with the Notepad++ binaries themselves.
And I agree with another comment here. With all those spelling mistakes that notification kind of reads like it could have been written by a state-sponsored actor. Not to be (too) paranoid here, but can we be sure that this is the actual author, and that the new version isn't the malicious one?
This is true for a large number of software "security" issues
A software version earlier in date/time is not necessarily inferior (or superior) to a version later in date/time
As it is "updated" or rewritten,, software can become worse instead of better, or vice versa, for a vaariety of reasons
Checking software's release date, or enabling/allowing "automatic updates" is not a substitute for reading source code and evaluating software on the merits