My program developed in TIA V15 and download program in plc using TIA V15 but TIA V15 is discontinued. Now I want to upload program from plc ?

Can I use TIA V15.1 for upload program ? Is it compatible ?

Hello,

Yes, it is possible. You can check it in the next FAQ: What options are available in STEP 7 (TIA Portal) for uploading when the project version in the CPU no longer matches the version on your PG/PC? 

I hope it helps you!