On any install of NPP, either updated from prior version or a fresh install, I am unable to add or remove any plugins. NPP resets, but the progress bars don’t show and no changes are made. I am using Windows 7. I have had this problem with every version since 7.3.x.
I found a solution that worked here:
@jnappo64 said in Cannot install plugins at all:
go to proxy configuration and delete 0.0.0.0
Hitting the [?] button on the right (next to [Window]), then > [Set Updater Proxy …]. Delete the ‘0.0.0.0’ from the ‘Proxy Server:’ field, delete ‘0’ from the ‘Port:’ field. Click [OK], then restart NPP.
Completely wiping these entries allowed plugin admin to install/delete/update as normal.
I do this now on every install. I have a reminder file set up in the folder I install NPP to, because I always forget and start to panic.
I know this topic is kinda old, but maybe it will work for you, or for someone else down the line.