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Still having trouble with getting Compose Preview annotation to resolve. Added the uiTooling implementation and compose-gradle-plugin:1.0.0-alpha1-rc1, all the stuff I found in the threads above.

Untitled

The error in the stacktrace says:
```Caused by: org.gradle.api.GradleException: * Illegal version for 'Msi': '1.0' is not a valid version.
  * Correct format: 'MAJOR.MINOR.BUILD', where:
    * MAJOR is a non-negative integer with a maximum value of 255;
    * MINOR is a non-negative integer with a maximum value of 255;
    * BUILD is a non-negative integer with a maximum value of 65535;
  * You can specify the correct version using DSL properties: nativeDistributions.windows.msiPackageVersion, nativeDistributions.windows.packageVersion, nativeDistributions.packageVersion```
This is not related to the preview. Native distributions have to follow OS specific versioning requirements. Here’s the relevant part of the docs <https://github.com/JetBrains/compose-jb/tree/master/tutorials/Native_distributions_and_local_execution#specifying-package-version>

The easiest way to fix the error is to set `packageVersion = "1.0.0"` like here (or just not package into dmg, msi, etc…) <https://github.com/JetBrains/compose-jb/blob/master/examples/widgets-gallery/desktop/build.gradle.kts#L31>

Also we recommend to use `1.0.0-alpha3` instead of `1.0.0-alpha1-rc1`.
With that version you don’t need to depend on `compose.uiTooling`. `compose.preview` is enough (also `compose.desktop.currentOs`  already depends on `compose.preview`, so you don’t need to add a dependency for application modules, that already depend on `compose.desktop.currentOs`)

Cool, thanks finally got it working. Set `package = "1.0.0"`  then updated to `1.0.0-alpha1-rc1`  then kotlin to
```kotlin("jvm") version "1.5.21"```
then changed `window {` to
```singleWindowApplication {```
And вот оно!