This is easy - just not intuitive is all. I am assuming the improvements were completed after the last renter moved out, and before the closing date of the sale.
Your property improvements will be entered in the Assets/Depreciation section (could be called Sale of Assets/Depreciation). Under no circumstances and with absolutely no exceptions, will you change anything for any asset already listed there.
When entering the new property improvements there is no need to depreciate them since they are never placed "in service" as a rental asset. But it can be a bit tricky to get the program to understand this. Here's how you do it.
Enter the asset and give it a business use percentage of ZERO percent. Then make your "in service" date any date between the date the last renter moved out, and the closing date of the sale.
In some situations the program will flat out refuse to accept zero percent business use. That's fine. Give it 1% business use and make the in service date the date of your closing on the sale. If any depreciation is taken (I doubt there will be, but never say never) it will be so negligible that it won't matter.
