I have more than 8 returns to complete with income > $25,000 (in Canada). Can I install more than one Standard Version of TurboTax for 2023 on my laptop?

You don't need to install the program again. Once you have use all 8 of your current returns, you can buy a second Standard licence, and then enter it using Tools > Licence Code Switch.

Thanks Susan for this information and for replying so quickly! Greatly appreciated!