nzbget 21.1 install for readynas os 6.10.7

don't know why i can't change it to NOT be under nighthawk routers..  

anywho..

i have an old readynas rndp6000-100nas that i've upgraded the firmware to the latest, plus i'm running OS 6.10.7

has anyone been able to install the latest version of nzbget stable (21.1) successfully?

The latest from the apps installer is 17.xx and it won't auto update. 

according to the developers, it should have no issue whatsoever installing and running on my version of the OS.

however, it won't install probably due to the letsencrypt cert issue. 

everything i find online addresses what to do if you already have nzbget installed and it stopped running because of the cert..  there is NOTHING to address a fresh install.

I've been following their instructions for the automated wget install, but it fails because of the expired cert, and if i upload the installer manually, that doesn't install either..  i'm pretty much useless when it comes to linux, so if anyone can give me some advice i'd greatly appreciate it.