Internet Download Manager Setup Error

[HoppaLong]

Type a few words from an error box into Google and there are usually dozens of
listings. I tried with this error message from IDM. No results.

The unpacker can't find the temp folder. What does that mean?

I know firewalls and antivirus apps can cause install problems. I was offline with
all security apps dormant, so they can't be the reason for this error box.

Any solutions?

[submix8c]

What OS are you installing on and what Version of IDM is it (give link, please)?