The main method of installation is to use opam. See this page for information about how to install opam on your system. Once you have installed and configured opam, you can use the following command to install the dolmen cli and lsp binaries:
opam install dolmen_bin dolmen_lsp
Additionally, pre-built binaries can be found on the release pages (starting from the v0.6 release for Linux and MacOS, and starting from the v0.8.1 release for Windows). You can get them on the latest release page.
A binary (which is using the above libraries), to parse and typecheck input files. This could be used to check a file against its language specification, and/or obtain detailed errors. See the bin doc
A LSP server so that the features of the above binary can also be used inside your favorite editor. See the dolmen lsp doc