diff --git a/.changeset/four-dancers-ring.md b/.changeset/four-dancers-ring.md
new file mode 100644
index 0000000..528ff8d
--- /dev/null
+++ b/.changeset/four-dancers-ring.md
@@ -0,0 +1,5 @@
+---
+"pactup": patch
+---
+
+fix: allow alias for which command and fetch nightly by tag
diff --git a/src/choose_version_for_user_input.rs b/src/choose_version_for_user_input.rs
index 80a0024..7c0c573 100644
--- a/src/choose_version_for_user_input.rs
+++ b/src/choose_version_for_user_input.rs
@@ -36,8 +36,6 @@ pub fn choose_version_for_user_input<'a>(
   let result = if let Some(version) = current_version {
     info!("Using Pact {}", version.to_string().cyan());
     let path = config.installations_dir().join(version.to_string());
-    // .join("installation");
-
     Some(ApplicableVersion {
       path,
       version: version.clone(),
diff --git a/src/commands/install.rs b/src/commands/install.rs
index b41f6dd..6c73ac0 100644
--- a/src/commands/install.rs
+++ b/src/commands/install.rs
@@ -94,8 +94,8 @@ impl Command for Install {
         return Err(Error::UninstallableVersion { version: v });
       }
       UserVersion::Full(Version::Nightly(nightly_tag)) => {
-        let picked_release =
-          remote_pact_index::latest(&config.pact_5x_repo).map_err(|_| Error::CantFindNightly {
+        let picked_release = remote_pact_index::get_by_tag(&config.pact_5x_repo, &nightly_tag)
+          .map_err(|_| Error::CantFindNightly {
             nightly_tag: nightly_tag.clone(),
           })?;
 
@@ -155,10 +155,7 @@ impl Command for Install {
     };
 
     if let UserVersion::Full(Version::Nightly(nightly_type)) = current_version {
-      if nightly_type == "nightly" {
-        return Ok(());
-      }
-      let alias_name = "nightly".to_string();
+      let alias_name = nightly_type.to_string();
       debug!(
         "Tagging {} as alias for {}",
         alias_name.cyan(),
diff --git a/src/commands/use.rs b/src/commands/use.rs
index 69dd020..77d7937 100644
--- a/src/commands/use.rs
+++ b/src/commands/use.rs
@@ -50,10 +50,10 @@ impl Command for Use {
         VersionFileStrategy::Recursive => InferVersionError::Recursive,
       })
       .map_err(|source| Error::CantInferVersion { source })?;
+
     let current_version = requested_version.to_version(&all_versions, config);
     let (message, version_path) = if let Some(version) = current_version {
       let version_path = config.installations_dir().join(version.to_string());
-      // .join("installation");
       let message = format!("Using Pact {}", version.to_string().cyan());
       (message, version_path)
     } else if let UserVersion::Full(Version::Bypassed) = requested_version {
diff --git a/src/commands/which.rs b/src/commands/which.rs
index 1039908..725013f 100644
--- a/src/commands/which.rs
+++ b/src/commands/which.rs
@@ -1,8 +1,10 @@
 use super::command::Command;
 use crate::config::PactupConfig;
-use crate::installed_versions;
+use crate::user_version::UserVersion;
 use crate::user_version_reader::UserVersionReader;
+use crate::version::Version;
 use crate::version_file_strategy::VersionFileStrategy;
+use crate::{fs, installed_versions, system_version};
 use colored::Colorize;
 use thiserror::Error;
 
@@ -29,17 +31,36 @@ impl Command for Which {
         VersionFileStrategy::Recursive => InferVersionError::Recursive,
       })
       .map_err(|source| Error::CantInferVersion { source })?;
-
     let current_version = requested_version.to_version(&all_versions, config);
-    if let Some(version) = current_version {
-      println!("{}", version.installation_path(config).display());
+    let version_path = if let Some(version) = current_version {
+      config.installations_dir().join(version.to_string())
+    } else if let UserVersion::Full(Version::Bypassed) = requested_version {
+      system_version::path()
+    } else if let Some(alias_name) = requested_version.alias_name() {
+      let alias_path = config.aliases_dir().join(alias_name);
+      let system_path = system_version::path();
+      if matches!(fs::shallow_read_symlink(&alias_path), Ok(shallow_path) if shallow_path == system_path)
+      {
+        system_path
+      } else if alias_path.exists() {
+        alias_path
+      } else {
+        let error_message = format!(
+          "Can't find an installed Pact version matching {}.",
+          requested_version.to_string().italic()
+        );
+        eprintln!("{}", error_message.red());
+        return Ok(());
+      }
     } else {
       let error_message = format!(
         "Can't find an installed Pact version matching {}.",
         requested_version.to_string().italic()
       );
       eprintln!("{}", error_message.red());
-    }
+      return Ok(());
+    };
+    println!("{}", version_path.to_string_lossy());
     Ok(())
   }
 }
diff --git a/src/remote_pact_index.rs b/src/remote_pact_index.rs
index 3c23e88..adc7957 100644
--- a/src/remote_pact_index.rs
+++ b/src/remote_pact_index.rs
@@ -198,6 +198,17 @@ pub fn latest(repo_url: &String) -> Result<Release, crate::http::Error> {
   Ok(value)
 }
 
+/// Prints
+/// ```rust
+/// use crate::remote_pact_index::get_by_tag;
+///
+pub fn get_by_tag(repo_url: &String, tag: &String) -> Result<Release, crate::http::Error> {
+  let index_json_url = format!("https://api.github.com/repos/{repo_url}/releases/tags/{tag}");
+  let resp = handle_github_rate_limit(crate::http::get(&index_json_url)?);
+  let value: Release = resp.json()?;
+  Ok(value)
+}
+
 #[cfg(target_os = "linux")]
 #[cfg(test)]
 mod tests {
diff --git a/src/version.rs b/src/version.rs
index 1cfb74a..4f80f30 100644
--- a/src/version.rs
+++ b/src/version.rs
@@ -68,11 +68,15 @@ impl Version {
   pub fn installation_path(&self, config: &config::PactupConfig) -> std::path::PathBuf {
     match self {
       Self::Bypassed => system_version::path(),
-      v @ (Self::Nightly(_) | Self::Alias(_) | Self::Latest) => {
-        config.aliases_dir().join(v.alias_name().unwrap())
-      }
+      v @ (Self::Alias(_) | Self::Latest) => config.aliases_dir().join(v.alias_name().unwrap()),
       v @ Self::Semver(_) => config.installations_dir().join(v.v_str()),
-      // .join("installation"),
+      v @ Self::Nightly(_) => {
+        if config.installations_dir().join(v.v_str()).exists() {
+          config.installations_dir().join(v.v_str())
+        } else {
+          config.aliases_dir().join(v.alias_name().unwrap())
+        }
+      }
     }
   }