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Hi Juan. Support suggested me the case I haven't thought before) So I've found a way to make it working. And now I am here to inform you that I've finished: Price-Optimizer now can handle variations! Please take a look. Remember to desetup & setup first in order to apply fresh changes.
As usual: in case of any question or issue - please let me know.

Hi Juan, I have news. I've contacted to Ecwid-support to get an opportunity of checking the Ecwid behavior in described by you case: when the base price is zero and there is a variation with non-zero price. What I've discovered: price-modifiers are applied independently - so I just can't add my own percent-based price-modifier which will be applied on top of your value-based price-modifier of your variation.
So the final (to the moment) answer to this case is: no, it's not possible to make it working, because price-modifiers are applied independently and I can't modify the price by percent-based modifier over value-based modifier.
I am going to send an email to Ecwid-support about the order of applying price-modifiers. Maybe they shouldn't be totally independent and be applied one by one in that order that is defined by their order in user dashboard? I am not quite sure it could help - but why not, I think I should try at least) If you have any questions or suggestions - feel free to throw several lines here.

Hi Juan. I got your case. For now the application would work - but with discount from 0% to 5% (individually for each product). It's because at Setup it does 2 things:
1) Creates price variation for every product with 3 options of discount: 0%, 3%, 5%. That variation is controlled by Price-Optimizer to choose the best price possible.
2) Increases price of the product for 5% - that step would lead to nothing in your case because of zero prices. That's why as a result it would work - but with discount from 0% to 5%.
You could decide whether it's affordable or not for you to use the application in such state. I am going to fix this issue by replacing direct price modification with adding another price variation - it should make it working for your case too. But this enhancement will take time to implement: about a week I guess. I am going to keep you notified about any progress done regarding this topic.

Hello, Juan.
That's totally fine, because the application adds its own hidden variation to every single product in your store (it happens during Setup - that's why it's important to launch Setup from your app dashboard). This variation does all heavy lifting for price optimization. This variation is hidden for end-users, it is used and controlled by the application.
So, to summarize my answer: no, Price-Optimizer doesn't modify the price of variations, it adds one single hidden variation to every product in your store.
Hope it helps. In case if you have other questions - feel free to post a reply here or start a new topic.
Regards,
Dmitry.

Sorry for late response - my notification settings were misconfigured.
In theory - yes, there could be such option to directly install. But the application uses Ecwid billing and tightly integrated with it. To pass around Ecwid billing I need to install (or develop) separate billing system. Otherwise it would be impossible to handle all of the billing-cases manually.
So the answer is: sorry, at the moment it's not possible, it's too hard to implement.

I am not quite sure I got your point right: what do you mean by "can't setup"? Please clarify: do you see any errors - or just see that the effect of price optimization is not applied?

I've checked your installation: the store marked as setup, the products are handled correctly. The only thing I've discovered is the problem in how the application reacts on product's changes: in some cases it wasn't able to create required product options. Now this behavior is fixed.
Please setup (desetup first if needed) the application using your dashboard - could you? Now it's fine or not?

In case of any questions - feel free to respond to this topic or start a new one.
Thanks for your feedback once more, Sonia.

Hello, Sonia.

Thank you for your feedback.
Looks like I've identified the problem, now I am digging in to investigate the reasons and to fix it. I am going to keep you notified about any progress with this issue.

Hello, netabood.

Sorry, I didn't get the point. Is there any problem during installation? If so - please provide your store ID.
Please clarify what do you mean by "direct install".

Regards,
Dmitry.

Greetings Ben,

I opened the site from your email - is it the site you were talking about?
I see no requests to price-optimizer.com - so it looks like the app was completely removed. Could you please clear your caches - and then re-check if the app is removed?
Also: please clarify how did you determine that it is not removed?

Hello,

Thank you for reporting, got it, I am currrently working on removing the app from your site, will report back in case of any update.