Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello,
Thank you for posting here in Microsoft Community.
To answer your questions, if you have purchased an Office 2019 license (one time purchase license), you will not have an issue activating or downloading it as long as you still have access to the product key or the account where the license is tied to. Also, make sure to uninstall the Office from the old device prior to installing it on another device. The grace period you are seeing when checking the "Office Software Protection Platform (OSPP)" refers to a specific duration during which a software product remains functional even if it hasn’t been activated, which same concept as a free trial, that's why you will see different results on each platform or device where you have checked it.
I hope this information helps!
Regards,
Arquel C.
Microsoft Moderator