Would there be any issue upgrading to 5.1.1 from 5.0.10 with a BF527? I cannot find any older release notes then 5.1.0. Does not look like there is any issues.
No, there should be no issues upgrading.
Upgrading is a simple process. First, you can obtain the latest version of VisualDSP++ (5.1.2) from the VisualDSP++ Development Software Product Page here:
Note the download file has a *.exe extension not a *.vdu extension as VisualDSP++ 5.1.2 is a separate installation to VisualDSP++ 5.0 rather than an Update.
When installing 5.1.2 you have the option to copy over the license from your existing version. To do this click on 'Advanced' when the installer asks for the installation path and check the box to enable copying over a license.
As for older release notes, I have attached a copy of the VisualDSP++ 5.0 UPdate 10.1 release note, which includes all prior updates from and including the VisualDSP++ 5.0 base release.