no it won't change anything for the error.
The cluster size can help you with the game loading speed. 64k will load faster than 32k.
change it only if your SD is slow. I'm happy with 32k speed.
Usually, Apploader size is zero means that DM/DML didn't find the game ISO.
It's often an error with DIOS MIOS, because users don't put the games on the correct partition.
Games must be on the first primary FAT32 partition.
If you have two USB connected, put the games on the USB Port0, or disconnect port0 if your games are on Port1.
Other possibilities:
- Verify that your dump is ok, just google for the md5 hash.
- Try to install the game again (delete the old folder before)
- Your loader is using an incorrect config version
- You installed DIOS MIOS and are trying to load a game from SD card
- You installed DIOS MIOS Lite and are trying to load a game from an USB device
Remember that you cannot have DIOS MIOS + DIOS MIOS Lite installed at the same time.
It's one or the other. Always the latest installed.
If you installed DIOS MIOS Lite but select a game from USB, DIOS MIOS Lite will mount the SD card and won't find the ISO.