Does the GSA SEO Indexer still work "2020" ?

I have tried but not indexed

1. how much time passed between program usage and index check?

2. what types of links are that?

3 day.. web 2.0 like medium, etc

give it more time...3days is way to less even with indexing services in my eyes.

thanks for the information

there are indexing services that work well. But they are not free. The expectation would be having confirmed crawling of links within a week. I cannot speak to Sven's indexer as I do not use it, but based on the excellent quality of his other software, I am sure it is competitive with other free software.