Theme version upload failure during Installation

I keep getting this error message with every attempted install: You need to upload a version of (theme name here) higher than 1.1. Increase the theme version number in style.css, then upload your zip file again. I’ve gotten this message with four different themes, so I’m sure something is wrong on my end.
When I go into the css stylesheet for that theme and update the version to some random number higher than what prompted the error in the first place, I cannot do a “save as” and it asks for a new file name to overwrite the existing stylesheet. THANK YOU in advance for any assistance!
Themes I’ve tried to upload are:
1. Icon
2. Willingness
3. A** Parralax
4. Ambition