[bugfix/527] Prevents a downloaded oculus version from launching the original oculus version is not present

src/main/services/bs-launcher/oculus-launcher.service.ts

@@ -127,6 +127,11 @@ export class OculusLauncherService extends AbstractLauncherService implements St
 
         const prepareDowngradedVersion: () => Promise<string> = async () => {
 
+            const originalVersionPath = await prepareOriginalVersion().catch(() => null);
+            if (!originalVersionPath) {
+                throw CustomError.fromError(new Error("Original Oculus Beat Saber not installed"), BSLaunchError.ORIGINAL_OCULUS_NOT_INSTALLED);
+            }
+
             const oculusLib = await lastValueFrom(this.oculusLib$.pipe(take(1), timeout(sToMs(30)), catchError(() => of(null))));
 
             if(!oculusLib){

src/shared/models/bs-launch/launch-event.model.ts

@@ -17,6 +17,7 @@ export enum BSLaunchError{
     PROTON_NOT_SET = "PROTON_NOT_SET",
     PROTON_NOT_FOUND = "PROTON_NOT_FOUND",
     UNKNOWN_ERROR = "UNKNOWN_ERROR",
+    ORIGINAL_OCULUS_NOT_INSTALLED = "ORIGINAL_OCULUS_NOT_INSTALLED"
 }
 
 export enum BSLaunchEvent{