These (and other handlers) have been moved to internal modules. The GetFile one with the release of Kentico 9
Removed Get... GetFile.aspx ... files, which were used to retrieve data. Modification of the these files is no longer possible because their implementation was moved into internal libraries.
Depending on your logic you could add a Global Event Handler:
Or use this in your code when verifying a page request is a file download. Here some help on how to add custom analytics:
A default Portal installation should have a sample Web Part with same logic located at:
I'm not 100% sure what the LogHit Codename is, but if you have the records already it should be easy to find out.