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Managed to install 10.4 (took a long time). Gone to import the migration files from10.3.3 which were successful.
Upon opening Rad Studio 10.4 I get the following errors.
and fails to open.
Before doing the migration I went into Rad Studio 10.4. Tried to change to Dark Mode, which it did, but after closing and going back in it reverted back to Light.
Same for me. Started C++Builder 10.4 after installation, everything looked fine. Updated Patch 1 and restarted. Then these two error messages showed up.
Started the migration tool one more time again and choosed 'Restore setting from backup'. Then 10.4 startet OK. Tried again to migrate the settings from previous version, and selected just 'Editor'. But 10.4 failed again to start.