I don't know what is the version of confluence so that i could verify is this the reason.
Is a way to install outside confluence add ons?
Dear @M. Celeste Correa
The reason could be, that you are searching from within the Confluence environment. This will only show you the add-ons which are matching your Confluence version. You can check your Confluence version in the server variant, on the bottom of your screen.. at your footer.
General Configuraion (from the gear by your avatar) -> Administration heading (Left side) -> System Information
Downloading an older version of a plugin:
Find the plugin on the marketplace through your web browser -> Click Versions -> Click See all Version -> Download buttons will be toward the right.
Installing from the download:
Add-Ons (from the gear) -> Atlassian Marketplace Heading (left Side) -> Manage Add-Ons -> Click Upload add-on (right side above your installed add-ons
Bear in mind that downloading an old version of an add-on that is not listed as valid
a) Probably won't work. Some won't load, others will only partially function and throw errors. Some will work fine. (The worst ones are the ones that look like they're working, but are silently trashing your data)
b) Is not supported, you won't be able to get help with it beyond "go use a supported version"
Do NOT do this download in production - test it on a dev/test server
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