feat(updater): support non zipped updater (#1174)

plugins/updater/src/error.rs

@@ -54,6 +54,7 @@ pub enum Error {
     /// UTF8 Errors in signature.
     #[error("The signature {0} could not be decoded, please check if it is a valid base64 string. The signature must be the contents of the `.sig` file generated by the Tauri bundler, as a string.")]
     SignatureUtf8(String),
+    #[cfg(all(target_os = "windows", feature = "zip"))]
     /// `zip` errors.
     #[error(transparent)]
     Extract(#[from] zip::result::ZipError),
@@ -62,6 +63,8 @@ pub enum Error {
     TempDirNotOnSameMountPoint,
     #[error("binary for the current target not found in the archive")]
     BinaryNotFoundInArchive,
+    #[error("invalid updater binary format")]
+    InvalidUpdaterFormat,
     #[error(transparent)]
     Http(#[from] http::Error),
     #[error(transparent)]