I goofed up & got transactions downloaded to the wrong account & I can't figure out how to fix it
huh ? How are you doing this, as transactions downloaded via One Step Update should go into their respective Quicken Accounts - same for manually downloaded QFX files and Imported into Quicken
If this is a one-time glitch (and not going to repeat itself next time you download transactions, however you do that) please do this:
Works with banking account registers only: To move the transactions from the incorrect register to the correct one, block-select the transactions just like you would block-select files in Windows File Explorer. Once all transactions are highlighted, right-click one of the highlighted transactions. Select "Move transactions" from the popup. Select the correct destination account register from a popup list and click OK.
⚠️ If all else fails and you haven't made too many other changes to your data file, restore your Quicken data file from a backup taken before the bad download. Once restored, repeat the download making sure to choose the correct destination register.