uninstalled lightroom 6 accidently and now i cant reinstall says down loader not available how can

The only working download is from the Internet Archive. See https://community.adobe.com/t5/lightroom-classic-discussions/p-lightroom-6-14-download-is-no-longer-available-on-adobe-servers/m-p/14357593#M352977

The link to ProDesignTools does not accesss the 6.14 installers any more.

Do yourself a HUGE favor and save this download file somewhere that you can find it in the future if you need it; as there is no guarantee that the Internet Archive will continue to off the download file indefinitely.

https://helpx.adobe.com/lightroom-classic/help/lightroom-6-end-of-support.html

Lightroom 6 is very old by now, and depending on what computer and OS you have, you might not be able to run the installer. However, it is worth a try.

You can find links to the direct downloads here at the ProDesignTools page:

https://prodesigntools.com/adobe-direct-download-links.html

ProDesignTools has done a great job over the years curating the direct Adobe download links, and at least you'll be able to get the installer. But again, whether the installer will run at all depends on your OS.