IDA "Corrupt" Databases

[Eleven]

They watermark a bunch of registration details including some values associated with the registration username/details which aren't made public to even the registered user. Unless you know where to look and what the values are it won't be easy to modify the database to work with newer versions.

However, with a few later releases of IDA there have been corrupt-database patches that allow it to load any database that has been blacklisted, so your best bet would be to search for that.