This is not the latest version of UMM!

The latest version can be found here.
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Changelog

Removed custom compression levels
- Unfortunately these caused memory corruption when used.
Fixed a rare crash when creating backups
updated zstandard to 1.4.4

Changes since 1.2.2

Folders and files starting with a '.' are now ignored by the installer.
- Please place any additional files or images you wish to include in your mod directory in a folder starting with a '.' or start their filenames' with a '.'.
Add the ability to launch smash from the dumper, in place of hashing.
- Hashing takes quite a while, especially with large files and on the switch's hardware. An equally effective and much quicker way to confirm that the game dump works is to just launch the game.
- Hashing is still available by holding R and pressing X.
Unofficial compression levels.
- Could theoretically allow previously incompressible files to fit.
Extra fast scrolling by holding in the right stick
Various optimizations that speed up the installer.
Compatibility with atmosphere 0.10.1.
General system stability improvements to enhance the user's experience.

View the README for more info about this program.