Graham,

Have you tried downloading the RealTracks installer from your online account? There is an automatic installer that downloads and install missing files in the background or you can choose to manually download and install files.

If you haven't used your online account, you may want to check it out.
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Jim Fogle - 2022 BiaB (927) RB (Build 5) Ultra+ PAK
Cakewalk - Zoom MRS-8 recorder
Desktop: i7 Win 10 build 2004, 12GB ram 256GB SSD, 4 TB HDD
Laptop: i3 64bit Win 10 build 21H2, 8GB ram 500GB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home