Hi Andrew, thanks for your tips. I already searched for these files. Unfortunately I cleaned recycle Bin. That was a good tip to recover the files from here. I don't know what happend. Maybe the connection to my external harddisk was lost, but like you said the update procedure don't delete files first. No big issue. Today I purchased a new external disk of 1 TB. I already have a 160, 320 and 500 GB external disk. I will reorganize all the data stored on those disks and will use the 160 or 320 GB for Biab only. First I will install Biab 2008.5 full version and then all the updates. Question: at this moment I have BIAB.exe running on my local c-drive and the RealTracks are located on an external disk. Can I install the complete Biab application including Realdrums and Realtracks on an external drive without performance issues (slower)?

Thanks,
Jan R.

piano: Hammond Skx Pro
guitar: Ibanez LGB30
guitar amp: Boss Katana 50 MKII