So i just bought the itch.io, just realize that the program is outdated.

Do i need to repurchase to get the patreon version ?

If you just want very basic cataloguing, then the itch.io version works just fine. However, if you want to place-shift videos or do more advanced things, the Patreon version is the one you need. If your wondering what the Patreon version can do, look at the product page again and scroll down to the Patreon section. There it will give you a summary of what the Patreon version is capable of. 

Edit: Since the OP changed his question, I will update my answer to reflect. In regards to Patreon, your subscription entitles you to the latest version of the tool. To avoid being overwhelmed by older support tickets and wasting dev time tracking down bugs we already fixed, we generally only support the latest version, leaving a few previous versions as a fallback option (in case a major issue prevents a user from upgrading, until we can fix it).  Once a major stable version is released, all outdated versions will no longer work.