The main download location for [ini4j] is the SourceForge download site.
[ini4j] also deployed into Maven Central repository, so if you are using Apache Maven build environment, nothing to do: maven will download automatically.
Download from Maven Central repository
If you are using Apache Maven build system, you need only specify [ini4j] as dependency:
<dependency>
<groupId>org.ini4j<groupId>
<artifactId>ini4j</artifactID>
<version>X.Y.Z</version>
</dependency>
For Linux users also easy to get [ini4j]. Most Linux distribution already contains [ini4j] as installable library, called: libini4j-java. You can use standard package manager (rpm/apt-get) to install it.
If you have NetBeans IDE installed on your computer, probably you already have [ini4j] :)