@dakota.wixom:
Over the years I have found that Topaz support usually replies within a day and the reply is on point. I am having difficulty getting an answer from support this time though.
See this sequence of messages with support and how after multiple attempts still no answer. The way things are going the sale will end before I can even install the trial to check it out. 
I contacted Topaz support with this query:
I have Gigapixel AI 6.0.0, but I want to download the trial of the current version to see if I want to upgrade. Will it overwrite 6.0.0? If I decide to not upgrade will 6.0.0 still be there and usable? Is there anything special I need to do to retain 6.0.0?
I have both an Apple Silicon Mac on Sequoia 15.3.2 and Win11 PC. I want to use the trial on both to check the speed.
By the way, when is the last day of the current upgrade sale price of $64?
I got this response:
At the moment, I don’t have the exact details on how long the Topaz AI promotion will run. However, promotions can At the moment, I don’t have the exact details on how long the Topaz AI promotion will last.
Promotions are often limited-time offers and can depend on various factors, such as the number of upgrades or potential new offers. I’d recommend watching it so you don’t miss out!
I then replied:
Thank you for your reply. What about my primary question below about installing the trial?
Then I got this response with links:
You can access our Gigapixel trials from our Topaz Labs Downloads Page. When you first install, you can click on Free demo or log in to start the demo mode. This won’t automatically charge you if the product doesn’t suit your needs - no need to provide any payment information to preview the enhancements.
Here’s our Quick Start guide for Gigapixel. The filters and functions sections will explain all of its uses in more detail.
I then replied:
But that does not answer my question about my existing version. Please reread my question down below. Thank you.
Can a Topaz employee please answer my question with regards to installing the trial while my existing 6.0.0 is also installed? Thank you.