I am running Windows Vista SP2 32 bit and the current version of Defraggler (2.10.424).
In the last version (2.10.413) I set Defraggler's scheduler to run once every month. It ran fine the first month [and maybe the second] but did not run afterwards. I could open Defraggler and run a defrag or run it from Windows Task Scheduler using the 'run' option but not using Defraggler's scheduler. I tried several other scheduling options and different times in Defraggler but I could never get it to run again, not even after uninstalling and reinstalling it several times, deleting temp files and deleting all Defraggler entries in the registry. It also would not show as an active task in Windows Task Scheduler even though it was in the Task Scheduler Library and showed the correct status and trigger. I did eventually get it to show as an active task in Windows Task Scheduler but it still would not run again.
One of the changes in the new version is "Re-architected scheduling manager". I downloaded and installed it. I scheduled Defraggler to run once every month and once again it ran fine the first month but did not run the second month. I cleared the scheduler and then reset it to run once for the next day. It ran fine so I scheduled it to run daily but it would not run again. Once the problem starts, if Defraggler's scheduler is set, the task does not show as an active task in Windows Task Scheduler until after the time has passed that Defraggler is suppose to run. After it shows active, if Defragglers scheduler is changed again it will still show as an active task in Windows Task Scheduler but still will not run. If the task is rescheduled in Defraggler again after it shows as an active task it will no longer show as an active task.
The Defraggler scheduling manager is still not working correctly.
I suspect that there are a lot of Defraggler users who are using the scheduler for periodic defragmentations and do not even realize that their hard drives are not being defragmented.
I have Defraggler scheduled to run a defrag once a month on the 28th day. Last month it did not run on the 28th. No surprise because as I explained above even though it is scheduled in Defraggler it was not showing as an active task in the task scheduler. I ran it manually on the 28th and checked the task scheduler the next day. It was now scheduled as an active task in Task Scheduler. Again no surprise as I also explained above. Earlier this month I installed the latest version of Defraggler (2.11.560). Today the scheduled defrag ran which I was not expecting since the latest version did not say anything about mods or fixes to the scheduling manager. This is the same thing that happened when I installed the last version. It ran when it was scheduled to run the first time but would not run again after that even if when I uninstalled and reinstalled Defraggler. It is looking like it will only run one time after a new version is installed then it will not run again through the scheduler until a new version is installed. The scheduled task is currently showing as an active task in the task scheduler. I do not expect it to run on the 28th of December but I will wait and see.
I installed version 2.13.670 in March. It had a couple of additions to the scheduler but nothing that looked like a fix to the scheduler problem mentioned above. I schedule it to run once a month and as usual, the first time after a new install, Defraggler ran on the scheduled date. Yesterday was again the time for Defraggler to run. To my surprise it ran on schedule for a second time in a row. If it runs next month this problem just might be fixed!
Softpedia is not an approved download site for Piriform products (though softpedia is high on google hits, it flaunts many developers' wishes and distributes illegally.
Official Download site is piriform or file hippo
Slim and portable can only be gotten from piriform iirc