Are you running Spine in a VM? If so, please try running Spine natively. If not, Windows has a feature called VBS that runs apps virtualized, meaning Windows runs apps in a VM without you knowing it, and this causes problems with Spine running offline. To disable VBS you can turn off "SVM" in BIOS:
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Turning off SVM should be sufficient. Otherwise VBS can be disabled in other ways, like this:
1) Run: Start > Run > gpedit.msc
2) Expand: Local Computer Policy > Administrative Templates > System > Device Guard
3) Double click: Turn On Virtualization Based Security
4) Set it to Disabled and click OK.
5) Reboot.
If you are running Windows 10 Home, you won't have gpedit.msc, which is the Group Policy Editor. There are some hacks to enable gpedit.msc (do an internet search).
Alternatively you can download and double click this registry file. That registry file is equivalent to doing this:
1) Run: Start > Run > regedit
2) Expand: HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Control > DeviceGuard
3) On the right side: right click > New > DWORD (32-bit) Value
4) Name it EnableVirtualizationBasedSecurity with a value of 0.
5) Expand: HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Control > Lsa
6) On the right side: right click > New > DWORD (32-bit) Value
7) Name it LsaCfgFlags with a value of 0.
8) Reboot.
Once Spine is not running virtualized, it will run offline. Please note that Spine must be run online first so it can download specific editor versions, then it will run those versions offline.
