OP wrote:
"I just bought a plan but Im not able to download Adobe software just because I have APFS CS format! They just saying that I need to format my computer to APFS."
Sometimes, things "are what they are".
In practical terms, that means "you gotta do, what you gotta do".
So....
What it looks like "you gotta do" is:
1. Back up your internal drive (I'd suggest CarbonCopyCloner or SuperDuper, either is free to download and use for 30 days)
2. Boot from the bootable cloned backup that these apps create
3. ERASE the internal drive to "APFS Case INsensitive"
4. Restore from the cloned backup by RE-CLONING it back to the internal drive.
It will take some time, but I believe the process will go smoothly and accomplish what needs to be done.