Hi,
Please take a look at this support forum post for the solution: https://www.akeebabackup.com/support/forum/admin-tools-support/500-error-accessing-waf-after-udate/55317.html#p55317
Regarding the installation messages, they are produced by the Joomla! Framework itself and I have no control over them.
The error message comes from JFile::copy(). Unfortunately, it can not be suppressed and it doesn't allow me to alter it in order to include the file name. If I could do that, I would! It causes me a lot of grief, especially since it makes it harder for me to find out what the problem is and solve it.
The "Installation complete" message comes from Joomla!'s Extensions Installer. No matter if you're doing a manual installation/update or using Live Update, the final package installation step is always carried out by the Joomla! Extensions Installer. This allows me to not have to write obscene amounts of Joomla! version-specific code for the component installation. The downside is that JInstaller seems to be on crack and throws cryptic or unfortunate messages. Unfortunately, I have no control over them either. And, yeah, if I could change them I would make them into something MUCH more user-friendly! It took me days of my life trying to trace back each one of those messages in order to write the installation troubleshooting instructions. I finally realised that the error message has little relevance to the root cause and I ended up with two pagefuls of instructions which look more like a shaman ritual to bring rain than real troubleshooting instructions :(
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!