ImageJ installation does not appear

[seth414]

Hi, I am a graduate student in a systems/developmental biology lab doing quantitative single-cell analysis on fluorescence microscopy images, and was hoping your plugin could help improve our segmentation in the case of overlapping nuclei, but I am having some trouble adding it to Fiji. I have tried installing it using the .jar file and ImageJ gives feedback that it is installed but I am unable to locate it in the plugins menu and was wondering if there is something I'm missing. I would really appreciate any help, bearing in mind that this is an older/no longer active project. I am sorry if this is something really basic/obvious that I'm doing wrong