I think I know why it is not working and I have no idea why it works for you.
I just downloaded again the file from the first post (now has 6 files). Extracted and copied to my sdcard.
On my tablet, run Root Explorer and browse to the directory where the files have been extracted.
Tap on AccountAndSyncSettings.apk and choose View. Now tap on the manifest file. You will see that this file is meant to Android 2.2.1 (we are running 2.1 update 1). This is also true on the new file, GoogleCalendarSyncAdapter.apk (it's for 2.2).
All the rest of the files are working and checking them, shows they are for 2.1.
I just downloaded again the file from the first post (now has 6 files). Extracted and copied to my sdcard.
On my tablet, run Root Explorer and browse to the directory where the files have been extracted.
Tap on AccountAndSyncSettings.apk and choose View. Now tap on the manifest file. You will see that this file is meant to Android 2.2.1 (we are running 2.1 update 1). This is also true on the new file, GoogleCalendarSyncAdapter.apk (it's for 2.2).
All the rest of the files are working and checking them, shows they are for 2.1.