The PortableApps team announced that the GrampsPortable 64bit version for Windows (requires 64bit Windows 8.1 / Windows Server 2012 R2 or newer) has been posted to their download page.
https://portableapps.com/…/2023-08-14–gramps-portable…
The v5.1.5 32-bit version for Windows has changed to ‘Legacy’ status. It will not be updated.