The current version of the product does not have any European data so it would require entry by hand. European airport lat/longs can come from several sources including navigation charts and several web sources such as:
If it is not possible to find an exact lat/long. Look for other nearby references. For graphing purposes, a reference to any nearby location may be enough to give satisfactory mapping results.
I can't say when the next version of Route Browser will be out, but I am currently on the lookout for a definitive source of European data similar to what the FAA puts out. If you or anyone else knows of a good source, please let me know.