I can confirm, yes.. Having a valid license of Windows 10 Pro (upgraded a few years back from 8.1), I was able to upgrade to 11 Pro at no cost.
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Steve

BIAB/RB 2022, Pro Tools 2020, Korg N5, JBL LSR 4328 Powered Monitors, AKG/Shure Mics.
PC: Win11 PRO, 1 TB SSD, 2 TB HD, 128 GB Memory