You can download our database as a single encrypted ChessBase archive (CBZ format file) which is about 226MB in size. This is how we distributed nearly all copies of our 2019 edition and it worked very well.
The password will be sent to you by email when we receive your payment, after which you can immediately open and use the database within the ChessBase program. (Later it may be possible to supply copies on CD-R if all the files fit but it will be much more expensive and slower for you.)
The CBZ file will expand to the full set of files comprising the database, and when you first do a search you will be prompted to create a search booster, which is recommended and only takes a few minutes. The size on disc is about 616 MB. ChessBase may create further supplementary files also. Eventually it could take up about 650 MB of space on your hard drive - more if you add opening keys.
NOTE: It is good practice to make a complete backup of the whole database (for example on a portable hard drive or USB key) before using it for the first time. This ensures you can always recover the files in future. We do NOT advise trying to alter the database in any way, especially not in earlier CB versions. This is general ChessBase advice for all large databases.
UltraCorr 2020 was created in ChessBase 14 but of course it will work in the new ChessBase 15 too. It has been tested in ChessBase 10 and ChessBase 8; to preserve compatibility we had to delete several Chess960 (Fischer-random) games. These earlier versions do not use all the subsidiary files.
It should also be possible to open and analyse games one at a time in Fritz but most database functions will not be available without the full ChessBase program.
It is also easily possible to convert the database to PGN for use with Aquarium and other chess software, as one customer already confirmed to us with the 2019 edition.