I don't see the Save button in the - Save Extract to Repository pop-up in GTSUBSET.
Subset UI - version - 184.108.40.206
Navigated to GTSUBSET via Datamaker.
More details in the below link
Windows 10 option to change the size of text, apps and other items.
Component : CA Test Data Manager
The problem was that on your Windows 10 64-bit machine you had set the font and application scaling size to 150%
once we reset this to 100% we could then see the save button as expected.