You may know this, but I think it will help others.
It's been so long that I can't remember the exact process, but when you purchased jbridge, you had to register your email with them, because that's how you get the latest installation files. Someone who has done this recently may want to chime in on that part of the process. I personally purchased jbridge long before BIAB/RealBand even supported it, so mine was purchased directly from jbridge, not PGMusic.
When you install jbridge, make sure you do so as administrator, as it writes its licensing information to the registry. Also, don't just download the demo version from the main web site. As long as you have registered your license code, you go to the
jbridge page and request a new installation file to get the latest version. You use your registered email address to get the new version (see images below).
Shortly, you will receive a file attachment in your email inbox. It will say:
IMPORTANT NOTE: In case your email provider blocks my email with your software, this is an alternate email sent with the file extension renamed, simply rename the attached file's extension from .RENAME_EXTENSION_TO_7z to .7z after downloading it.
This is new; you used to just get the .7Z file in your inbox, but some mail providers block compressed attachments, so this is to ensure you get the file. Just download the file to your Desktop (or wherever you download your installation files). Rename the file to replace everything after the period to .7z (instead of ".RENAME_EXTENSION_TO_7z").
When you extract the file, you will be asked for a password. This password is contained in the same email that also had the new jbridge file.
The extracted file will be another compressed file, this time in .ZIP format. Just extract the zip file as you did the .7z file. There is no password for the zip file.
You will now have an .EXE file that you can run to install jbridge. Right click on the file and select "Run as Administrator".
This will install jbridge onto your computer. That registers it into the Windows registry. Once you have installed jbridge, you should reboot your computer. That's all you need to do for BIAB. It will automatically know that jbridge is installed and you can load 64-bit VSTi's and 64-bit VST's. Be aware that some VST/VSTi's have exactly the same name when loaded, so for some of them, you need to first unlink the 32-bit version to use the 64-bit version, as BIAB can only have one like name at at time. As I recall, Kontakt is that way. Unless they've changed it, if you try to load the 64-bit version and the 32-bit version is already in the list, you just end up with where you were (with the 32-bit version).
jbridge also has a utility call "jbridger", which is used to create wrappers for 64-bit VSTi's for use in 32-bit hosts. BIAB and RealBand don't need the "bridged" version files, as it handles it internally automatically. But other hosts may need it, so you'll just have to read the docs for each host.
If you know have WinZip or WinRAR on your computer, you can download the free 7-zip utility to decompress the installation files. I don't believe the built in Windows unzipper works with 7z files. You can use the Windows unzipper for the ZIP file, but not the initial 7z file.
Hope this made sense.