CCleaner update file size

When CCleaner 5.19 was first issued I took a note of the file size to be able to verify the download for others in my company. Then it changed, I think it was reduced about 100 bytes... not much but why?

Now it seems that the file for the same version of CCleaner from the same url has changed again! It has increased in size 1MB.

Why is this?

It would be really good in my mind if the file size didn't change and if there is a change to the program there should be a change to the version number.

Blessings

what was the URL?

http://download.piriform.com/ccsetup519.exe

No change in program, maybe the new installer