Neptune.cls Download |best| -

If you plan to use it frequently, move it to your local TeX directory:

If you’ve ever tried to typeset a professional academic paper, a complex thesis, or a high-end technical journal in LaTeX, you’ve likely realized that standard classes like article or report don’t always cut it. Enter .

Search the Overleaf Gallery for "Neptune." You can "Open as Template" directly, which saves you the trouble of a manual download. Installation Guide: Making it Work

Many .cls files "call" other packages (like geometry or fancyhdr ). If your compiler complains, ensure you are connected to the internet so LaTeX can auto-download the missing dependencies.

If you don't want to manage local files, Overleaf often hosts these classes.