To install from source you can use:
sudo python ./setup.py install
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usage: picasasync [-h] [-n] [-D] [-v] [-m NUMBER] [-u] [-d] [-r]
[-t [THREADS]] [-o ORIGINS] [--max-size MAX_SIZE]
[--force-update [{full,metadata}]] [--delete-photos]
[--strip-exif] [--transform TRANSFORMS] [--delete-albums]
PATH [PATH ...]
Sync one or more directories with your Picasa Web account. If only one
directory is given and it doesn't contain any supported file, it is assumed to
be the parent of all the local albums.
positional arguments:
PATH Parent directory of the albums to sync
optional arguments:
-h, --help show this help message and exit
-n, --dry-run Do everything except creating or deleting albums and
photos
-D, --debug Debug Picasa API usage
-v, --verbose Verbose output (can be given more than once)
-m NUMBER, --max-photos NUMBER
Maximum number of photos in album (limited to 1000)
-u, --upload Upload missing remote photos
-d, --download Download missing local photos
-r, --update Update changed local or remote photos
-t [THREADS], --threads [THREADS]
Multithreaded operation. Set number of threads to use
on album processing. If not given defaults to 1, if
given without argument, defaults to number of CPU
cores (4 in this system).
-o ORIGINS, --origin ORIGINS
Timestamp origin. ORIGINS is a comma separated list of
values "filename", "exif" or "stat" which will be
probed in order. Default is "exif,stat".
DANGEROUS:
Dangerous options that should be used with care
--max-size MAX_SIZE Maximum size of photo when using --transform=resize.
Default is 2048,2048.
--force-update [{full,metadata}]
Force updating photos regardless of modified status
(Assumes --update). If no argument given, it assumes
full.
--delete-photos Delete remote or local photos not present on the other
album
--strip-exif Strip EXIF data from your photos on upload.
--transform TRANSFORMS
Transform the local files before uploading them.
TRANSFORMS is a list of transformations to apply, from
"raw", "rotate" and "resize".
VERY DANGEROUS:
Very dangerous options that should be used with extreme care
--delete-albums Delete remote or local albums not present on the other
system