I cannot open my Design on PC because of a Version missmatch, BUT I have the latest version as seen in the picture.
Please check the updates in the Library tab, MS store doesn’t show an “Update” button the app’s page, even if there is a new version available. Latest version is 5.371.5150.0 , you can check this in the Settings page of the app. Here is a little help how to force the store to update:
It worked, thanks alot!