When you updated, did you use the Update option in the installer?
If so, then there should've been no need to move anything, as your scripts would've still been recognized via the mirc.ini file (which wouldn't have been over-written)
If not, then that might explain the reason for the problem you're having. Fortunately mIRC automatically does an automatic back-up of your mIRC files. The back-ups are located in a sub-directory of your mIRC installation directory, that is called backups (genius thinking on that name..
)
Anyhow, I suggest that you restore your previous settings from the back-ups, ensure that all of your scripts and so on are working correctly with the restored version, then update using the Update option in the mIRC installer.