I installed twice (Revive Adserver v5.0.0-RC1 as tar.gz) on Centos 7 with PHP 7.3.** (Nginx+Apache+MariaDB) but failed to get any plugin installed. It show only "Choose Section: Plugins/ Groups" and I"nstall new plugin" with Browse, Install, Import (code only). I discovered it at the time of generating Invocation code (not working at all) for a zone. Although, with Chrome browser, I failed to switch to user mode (administrator/ Default Manager) although with IE v11 it works. Can it be possible to manually install plugins by downloading them (even seeking for download URLs)?
On Windows 7, using WAMP, I installed (Revive Adserver v5.0.0-RC1 as zip) today and it has been working (serving banners to page), although I didn't managed to check more esp. what I experienced/ learnt from using V4.2.0 on my laptop few months ago.