You said you "do have the most recent ios" (I assume you mean macOS (not iOS) Catalina)—according to an updated iZotope support page, that error message is related to trying to install with Catalina:
They don't offer a solution (other than to not upgrade the OS yet), which would suggest they don't have one at this point—at least not officially. I did find at least one user reference to that particular error message—no mention of the OS in use, and it was in relation to installing Ozone 8, but apparently that person was told by iZotope to try turning off iCloud and doing the install, and he claims it worked, so maybe that'd be worth a try.
If you still can't get it going, you may just have to wait for Catalina compatibility, unless you have a disk/partition that will let you boot into an older OS (Mojave?).. The best bet would be to call iZotope support directly, if possible—since they're actively testing/tweaking their product line for Catalina there may be more up-to-date information available any day..