https://kb.1ci.com/1C_Enterprise_Platform/FAQ/Administration/Misc/Installing_1C_Enterprise_platform/

The installer makes it possible to install multiple 1C:Enterprise versions on a single computer, select components to install, and choose a version of 1C:Enterprise server installation. 1C:Enterprise software modules are universal and compatible with any configuration. A security driver preventing unauthorized access is installed along with 1C:Enterprise.

Installer's variants:

32-bit and 64-bit versions.

32 bit OS is for old PC with system type 32-bit operating system, x86-bit based processor (check System type it in This PC > Properties):

64 bit OS is forPC with system type 64-bit operating system, x64-based processor (check System type it in This PC > Properties):

• 1C:Enterprise 8 Thin clien
• t allows you to install only the thin client and the components required to access the 1C:Enterprise server. 32-bit and 64-bit versions of this installer are available.
• 1C:Enterprise 8 (x86-64) allows you to install 64-bit 1C:Enterprise server. Only 64-bit version of this installer is available.

Unzip downloaded archive and find the file setup.exe:

Double click on the file to start installation, then click next:

Select for installation the      features:

Click Next and Finish on the subsequent windows to complete the installation:

Open 1C Enterprise application clicking the icon on your desktop and click "Add" to add a new database in your list:

Select the option to add existing database:

Depending on the type of your database and connection select appropriate option, specify details, then click Next and Finish:

If the database is placed in the folder in your network then select the option #1 and specify the path.

If you have a link to connect to the database then select the option #2 and past your link there.

If you use server database and connection then choose the option #3 and specify server and database names.

To check connection select your database and click "1C:Enterprise":

If everything is done correctly then you will see the screen presenting user and password input: