@Helvetosaur
I don’t think so. A V5 license DID work for the V5 WIPS.
At least internally, the V6 Mac WIPs (not stable enough to be released), DO NOT use a V5 license key. They have their own MR6B keys.
V7 WIPS will use a valid V6 license. There will be no more “beta” keys after Mac V6 development.