variable product price

Hi is it possible to manage variable product price with the free version of your plugin, or do i need to buy your premium version of the plugin?

For this product: https://xenial.ch/produkt/brunox-rostumwandler/ i do get an error in my google merchant center. For the two containers with 1 Liter respective 5 Liters it tells me, that there would be shown a different price on the website (7.90) itself vs. the price of the feed (39.90). Even though the Merchant Center shows this Product Link:
(https://xenial.ch/produkt/brunox-rostumwandler/?attribute_gebindegroesse=1+Liter&utm_source=Google%20Shopping&utm_campaign=shoppingfeed_xenial.ch&utm_medium=cpc&utm_term=1058) in my opinion ther it states that the price ist 39.90 wich would be correct (with the feed itself)

Same thing with for example the 5 Liter container. Link: (https://xenial.ch/produkt/brunox-rostumwandler/?attribute_gebindegroesse=5+Liter&utm_source=Google%20Shopping&utm_campaign=shoppingfeed_xenial.ch&utm_medium=cpc&utm_term=1059)

The smaller Containers (250ml) do show an incorrect price on the google shopping ads (there it shows 7.90 instead of 19.90, wich would be correct). (Link:
https://xenial.ch/produkt/brunox-rostumwandler/?attribute_gebindegroesse=250+ml&utm_source=Google%20Shopping&utm_campaign=shoppingfeed_xenial.ch&utm_medium=cpc&utm_term=1057)

Thanks so much for your help!!