Hi every one!

miRNA 3.0 CDF Library File  is present at affymetrix site

However, while I want to use affy (not oligo) for analysis of this type of array, I get the error that mirna30cdf not available. Any help would be appreciated.

You cannot use the affy package for analysis of this array, because it re-uses the same probes for multiple probesets. The only way to analyze this array is to use oligo. Is there some reason you don't want to do so?