Actually, you can do this by using ADODB.Stream object, but all 36 images could not be made available for download at once. You can link each image to another asp page, which shall use the adodb.stream object to read image data from file system and pop-up the dialog for visitor to save the image.
Here is a short example of reading a zip file from drive and make it available to the visitor to downlaod it. you'll need to modify it to meet your needs

...
Code:
set oFile = server.CreateObject("ADODB.Stream")
oFile.Open
oFile.LoadFromFile ("C:\files\download.zip")
oFile.Type = 1
sFileData = oFile.Read(-1)
lsize = oFile.Size
oFile.Close
set oFile = nothing
Response.AddHeader "Content-Disposition", "attachment; filename=" & chr(34) & "download.zip" & chr(34)
Response.AddHeader "Content-Length", lsize
Response.ContentType = "application/x-zip-compressed"
Response.Flush
Response.BinaryWrite sFileData
on error goto 0
Response.End