I saw this free plugin offer via Studio One Expert, but the 100% off discount code works through August 10 for anyone (and it's AAX as well, it comes as VST-AU-AAX)
Go to the UJAM site and use: Sparkle (100% voucher): 2tj2-wlav
https://www.ujam.com/partner-checkout/?partner=presonus
There is also a 50% off code for other UJAM virtual guitar plugs (Iron, Amber, Silk): lj6p-z5gq