itch.io

Old version is $3.5 and new version is $3.9 because of this increased price if you bought the project with minimum price of let's say $10 it will covered any current or future files inside the project that with the price tag below $10. I guess this is how the Itch.io project system works. So if you bought $3.5 at the first time for the whole project and if there is a new file with higher price tag uploaded or the current file price tag changed to higher value than $3.5 it will not able to be accessed by the buyer.

So the only way to solve this is if the buyer always wants to get the latest version with the same/old price tag, the seller must not changed the original price tag or increase it. Since the seller wants to have increased price due to the increased amount of contents, the seller can provide a new seperated download file from the original file. Because of this, now the project has two download versions with two different price tag.

For new customers, they can choose whether wants to buy the old version with less contents or new one with much more content with a higher price. For old customer who have purchased it before, it depends on whether they have purchased it with higher price or the exact same price, it's always better to buy for a higher price at the beginning to prevent any locked future contents with high price tag.

There is a workaround on this system to get a better value, if you bought the asset pack inside a bundle sale and let's say the bundle is $10, and now with that price tag can apply to all the projects that you bought inside that bundle. Therefore you can access the files inside a project if their price tag is less than $10.