Just to make this clear to me: is 1.50 newer than 1.47 or is the significant zero in 1.50 ignored?
Version numbers aren't decimal numbers. 1.50 is newer than 1.47. But 1.5 is older than 1.47.
I want to update my application from 1.9 to 1.10, but given your example above that is not possible.
If you read the example closely you'll see that 1.9 to 1.10 is perfectly acceptable. Also, if you have any question about whether a version number is newer or not, simply type them into wyBuild. The version tabs automatically rearrange themselves based on the version numbers you type in.
Short answer: 1.9 to 1.10 is fine.