It compiles OK, runs tests OK but won't install at all

I find the same problem - not because of the ' ', but because make install is unable to create new directories in C:\Program Files - even when I'm running as Owner.
That is, I get "Access is denied" error.
I don't know how to work around that.

However, when I switch to attempting to install into a location that does allow me to create new directories (eg C:\_64\Program Files\perl), then the space between 'Program' and 'Files' creates problems.
The only workaround I came up with (drawing on earlier posts in this thread) was to:
1) Create C:\_64\Program Files directory (unless it already exists);
2) set INST_TOP to $(INST_DRV)\_64\PROGRA~1\perl

But if you're intent on installing perl into C:\Program Files and you're hitting the "Access is denied" error, then I can't really help.

Cheers,
Rob