The 500px Lightroom plugin is no longer supported by the 500px team. This means we’re not currently making updates to it, and our Support Team is no longer available for assistance or troubleshooting with any version you may have access to.
This also means that we have removed the ability to download it from our site. We caution the usage of the 500px Lightroom Plugin or downloading it from any other sites since it has been depreciated.