Fritz Update File
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What is a IUP file?
Software update file used by Fritz, an online chess playing program; contains data that upgrades the software from one version to another version; typically is downloaded automatically when a new update to the software is available.
If the Fritz software is not automatically updated, users can manually apply the update by downloading the IUP file, placing it within the Fritz installation directory, and running the program IUPgrade.exe, which is included with the software installation.